Bodies and Language: The Dynamic Duo

“Parlez-vous anglais?” I find myself saying this phrase in almost every interaction I have with a French speaker–ordering food, asking for directions, shopping. The answer I dread occasionally follows, “Non…” The first thought that comes to mind is “I should have kept up with French in elementary school.” Then I resort to my next resource: my hands. Hand gestures not only help me communicate but help me understand what the other person is saying. Over my past two weeks in France, much of my French vocabulary stems from these gestural experiences.

This resource came in “handy” (pun intended!) when I found out, after returning home from a group project meeting at 1am, that my room key deactivated. I went to the security guard in my dorm and said, “Bonsoir, Parlez-vous anglais?” His reply: “Non…” I proceeded to try to tell him through hand gestures and pantomime that my card does not work. He responded back to me in rapid French. Surely, the puzzled look on my face cued him to speak slower and provide some supplemental help: gestures. I understood and still remember nearly all the words he said after that cue.

Cité Universitaire – Where I live!

Why did I understand and can now remember the words the security guard said? In a study done by Mayer et al. (2015), researchers found that self-performed gestures enhance learning a foreign language. The study supports the cognitive neuroscience theory known as multisensory learning, a concept that “attributes the benefits of enrichment to recruitment of brain areas specialized in processing the enrichment” (Mayer et al., 2015).

How the human brain most effectively learns foreign languages still puzzles many researchers. Typical in-classroom settings use verbal learning techniques to teach new languages; however, Mayer et al. (2015) investigated the benefits of enriched learning methods, such as pictures and gestures, as compared to learning methods without enrichment, verbal learning. While they found learning with self-performed gestures more effective than learning with pictures, both enriched approaches benefitted the learner more than the utilization of strictly verbal learning.

Mayer et al. (2015) conducted the research by having two experimental groups. In the first experiment, 22 German adults, split into groups of seven or eight to simulate a classroom learning environment, learned foreign language words under three conditions. The participants first learned words by watching a large projection screen where a person performed gestures symbolic to the word’s meaning and then repeated the gesture. The second condition utilized the photo enrichment approach, where participants looked at a picture projected on a large screen and then, as the picture was presented a second time, traced a line on the picture with their finger in the air. The third condition acted as a control condition, where participants learned words with no enrichment.

My experience with the security guard somewhat mimicked the gestural enrichment condition of Experiment 1. As the security guard said to me, “Je” (pointing to himself), “donne” (pantomiming giving me something), “vous” (pointing to me), “un clé” (holding up the new key card), “fin” (crossing his hands), “après une jour” (distinguishing with his finger today versus tomorrow). As he made these gestures, I tried to follow him to make sure I understood what he was saying. Surely enough, I did. Even better, almost a week later, I remember the meaning of those words!

In the study, Mayer et al. (2015) confirmed the benefits of enriched learning through functional magnetic resonance imaging (fMRI) of the brain. After a week of learning foreign language words under the three conditions, the researchers collected brain images measuring blood-oxygenation-level-dependent (BOLD) responses, a method of fMRI to observe activity in the brain or other organs, while they presented the participants with auditory foreign words and asked them to select the correct translation on a response screen.

For translated words learned with gesture enrichment, the fMRI images show brain activity in the biological motion superior temporal sulcus (bmSTS), an area sensitive to perception of others, and motor areas of the brain. For translated words learned with picture enhancement, the fMRI images show brain activity in the lateral occipital complex (LOC), an area of visual-object sensitivity.

A) LOC (Lateral occipital complex) BOLD responses  B) bmSTS (biological motion superior temporal sulcus) BOLD responses C) Correlation of gesture and picture enrichment benefit  Figure S2 - Mayer et al. (2015)

A) LOC (Lateral occipital complex) BOLD responses
B) bmSTS (biological motion superior temporal sulcus) BOLD responses
C) Correlation of gesture and picture enrichment benefit
Figure S2 – Mayer et al. (2015)

In further analysis of the fMRI images, Mayer et al. (2015) found significant correlations between gesture and picture enrichment with distinct brain activity in sensory and motor areas as compared to neuronal activation for words learned without enrichment. The data show that using the gesture enrichment benefited the learner more than the picture enrichment; however, both enrichments benefited the learner more than no enrichment.

Mayer et al. conducted a second experiment where another 22 German adults learned foreign language words under the three enrichment conditions, but participants did not imitate the gesture or trace the picture, thus excluding a motor component. Photo enrichment benefitted the learner more than gesture, in this case; however, looking at the study as a whole, gesture enrichment enhanced learning the most.

Experiment 1 and 2 results demonstrating the benefits of enriched learning approaches to foreign words Figure S3 - Mayer et al. (2015)

Experiment 1 and 2 results demonstrating the benefits of enriched learning approaches to foreign words
Figure S3 – Mayer et al. (2015)

Each finding of the study supported the hypothesis that implementing enriched learning methods, as compared to learning methods without enrichment, would increase correct translation of foreign language words. The study also continuously supported the multisensory learning theory in that distinct brain activity occurred in sensory and motor areas of the brain when translating foreign words that participants learned with enriched learning approaches. Not only can language teachers use the findings of this study to enhance their students’ learning but also future researchers can apply the data to better understanding learning disorders, such as dyslexia or processing issues. While overall a compelling article, I believe Mayer et al. (2015) should have tested whether being monolingual, bilingual, or polylingual prior to the study had any confounding effects on acquisition of foreign words.

My enriched learning experience with the very patient and kind security guard probably influenced why I can remember the meanings of those French words. By watching him gesture almost every word and by copying these gestures, politely of course, to internalize them, I employed both visual and kinesthetic associations to the French words, and thus, enriched my learning of these words. Hopefully I experience more enriched learning of French words… without getting locked out of my room!

 

 

 

Resources:

Mayer KM, Yildiz IB, Macedonia M, Kriegstein K (2015) Visual and Motor Cortices Differentially Support the Translation of Foreign Language Words. Current Biology 25(4): 530–535

Mirror, Mirror on the Wall, Where is the Bestest Dessert of Them All?

Whenever I travel to somewhere new, I always love exploring their authentic cuisine first. Of course, when I told my friends and family that I was going to Paris for study abroad, everyone told me about all the delicious food the French have to offer. Baguettes, éclairs, escargot, et cetera…you name them. Thus, two weeks ago when I arrived in Paris for the first time, I began my hunt for the perfect dessert!

The hunger (and thirst) has been real. Every corner lies a cute patisserie filled with glass cases of tempting desserts. Where do I even begin?! During the first week of the program, our class went on an excursion to Pere-Lachaise cemetery, a beautiful (though slightly haunting) place where many famous people like Oscar Wilde and Chopin are buried. Our instructors led a group scavenger hunt and the prize was a box of French macarons! This was the perfect opportunity for me to try my first macaron in Paris! Being the competitive person that I am, I hurriedly found most of the tombstones on the list with my team while the clock was ticking.

Here is a picture of the winning team snacking on a yummy macaron!

Here is a picture of the winning team snacking on a yummy macaron!

Little did I know the stress induced by this race had led me craving for sweets. This made me wonder – why do I always crave chocolate and sweets whenever I’m stressed? So then I decided to do some research and found some neuroscience to explain this occurrence.

In a study done by Macedo and Diez-Garcia in 2014, they found that excessively ingesting sweet substances may decrease the effects of stress in women and impact leptin levels. You might ask – what is leptin and why does it matter? Well, leptin is a hormone that regulates your appetite and controls energy by restoring it to normal levels in the body called homeostasis. At these normal levels, leptin promotes a feeling of reward by acting on the mesolimbic dopaminergic system. The mesolimbic dopaminergic system is a reward system in our brain and is activated when we do things that are pleasurable, such as eating or even abusing drugs.

Source: http://highered.mheducation.com/sites/dl/free/0072562463/91056/fig1606.jpg

Here is a diagram of the mesolimbic dopamine “reward” system.

Anyway, leptin levels rise after you eat and stimulate anorexigen neurons, which suppress the appetite. Basically leptin helps you feel full so that you don’t overeat. It has been found that leptin decreases the feeling of reward in the overweight.

The researchers wanted to study how sweet cravings (SC) in women are related to stress and how SC affect leptin levels in the body. They performed this study in 57 women and divided the participants in two groups – “stress-free” and the “stressed.” These women took a survey that asked them if they had a strong desire to eat sweet food over the last three months in order to identify them as a SC participant. The women then had their blood drawn to measure hormone levels and the researchers measured their body composition.

After controlling for a multitude of factors, they found that among the stressed women, 77.42% had SC. They also found that SC women had significantly higher leptin levels. One way to explain this might be because leptin acts on the hypothalamus (area in the brain in charge of hormones) and suppresses the response to sweet food, changing people’s sensitivity to sweet foods (Niki et al., 2010). Therefore Macedo and Diez-Garcia concluded that stressed women are more prone to SC and this condition is associated with increased levels of leptin.

This study has helped me understand why I keep craving for sweets in Paris. After all, coming to a whole new country has been an overwhelming experience, especially since I have to balance schoolwork and explore the beautiful city at the same time. Five weeks is a lot shorter than I anticipated and I want to travel all over Paris but alas, this is a study abroad program so there is work to do! Now I understand how stress has affected my appetite.

Even at the local Monoprix (the French version of Target), I found myself strolling down the aisles of chocolate and buying a couple bars to snack on later. Back home, I never really buy chocolate because it has never been a habit of mine. A scientific review done by Sinha and Jastreboff (2013) claim that acute stress can increase food intake, especially when highly palatable, calorie-dense foods are available. This helps explain why I keep craving for high-calorie sweet things here! Another study researched on the psychoactive effects of chocolate and desire for more chocolate. They found that the sugar and cocoa contents of chocolate are primarily related to the desire to consume more of it (Nasser et al., 2011). This may explain why I usually eat more chocolate if it’s dark than when it’s just white chocolate. Who knew you could tie in food and neuroscience in Paris?!

Before I go, I wanted to finish this blog post with a few pictures of the delicious desserts I have found and also a map of where I’ve traveled.

Other delicious desserts in glass cases all over Paris – they are always so colorful and pretty!

Delicious desserts in glass cases all over Paris – they are always so colorful and pretty!

Éclair heaven in a patisserie near the Accent center where I go for classes every day! My personal favorite is the Speculoos éclair – om nom nom!

Éclair heaven in a patisserie near the Accent center where I go for classes every day. My personal favorite is the Speculoos éclair – om nom nom!

Lastly, a map of all the places I’ve visited for desserts in Paris. Hopefully by the end of this trip, I’ll have red pins all over!

Lastly, a map of all the places I’ve visited for desserts in Paris. Hopefully by the end of this trip, I’ll have red pins all over!

My journey for yummy desserts does not end here! I shall keep you updated on what and where I eat. Bon appetit, readers 🙂

-Kimi Chan

References:

Macedo D, Diez-Garcia R (2014). Sweet craving and ghrelin and leptin levels in women during stress. Appetite. 80:264-270.

Nasser J, Bradley L, Leitzsch J, Chohan O, Fasulo K, Haller J, Jeger K, Szulanczyk B, Del Parigi A (2011). Psychoactive effects of tasting chocolate and desire for more chocolate. Physiology and Behavior. 104(1): 117-121.

Niki M, Jyotaki M, Yoshida R, Ninomiya Y (2010). Reciprocal modulation of sweet taste by leptin and endocannabinoids. Results and Problems in Cell Differentiation. 52: 101-114.

Sinha R, Jastreboff A (2013). Stress as a common risk factor for obesity and addiction. Biological Psychiatry. 73(9): 827-835.

 

A Midsummer Night’s Dream in Paris

This Saturday marks my 23rd week in Paris. As I get more acquainted with and orientated in this beautiful city full of history and modernity, I feel increasingly happy with my decision to study abroad here.

I lived with a home stay in the 8th arrondissement for 5 months before moving to the Cité Universitaire for these last 5 weeks. [image source: Google Maps]

Delving fully into the language and culture, I’ve had the opportunity to see the polar opposite sides of a resident filled Paris in January to the overwhelming influx of tourists starting early April. Despite the heat of an underground metro without air-conditioning and the invasion of foreigners in a city I now claim as my own, I find myself more in love and happier with my Parisian experience every day as I near my final weeks here.

Lately, I’ve noticed the city stays light long past dinnertime so I take the scenic route home while I usually head straight back to my room to start my work.   However, am I really succumbing to the City of Love . . . or is the lingering sun really the cause of my increased feelings of happiness and simultaneous difficulty in focusing on my work? At a latitude of 48.8457°N, Paris currently experiences days that last over 16 hours (Sun and Moon, 2015). Due to such a northern latitude, we get 2 more hours of daylight to explore the city here in Paris than the 14-hour days Emory University receives in Atlanta, GA.

Sunset at the base of the Eiffel Tower at 9:35pm on May 26th, 2015

Sunset at the base of the Eiffel Tower at 9:35pm on May 26th, 2015

Light on Happiness

The circadian rhythm follows a 24-hour clock that changes our biological, mental, and behavioral processes in response to light and dark (Jackson, 2014). Light, a main natural cue we receive from our environment, regulates these rhythms and is affected by changes in daylight from one season to the next. While little research has been published showing that sunlight will actually make you happier, many studies have been conducted on the topic of light significantly easing depression. A current study aims to artificially mimic the effects of daylight through the use of light therapy for clinically depressed patients suffering from seasonal affective disorder (SAD), where symptoms of depression manifest particularly during winter months when there is a marked decrease in available sunlight (Reeves et al., 2012). Participants received 1 hour of bright light therapy and 1 hour of placebo (a dim red light used as a phony treatment and expected to have no clinical affect) in a randomized order. Using two different self-reporting depression scales, the Profile of Mood States-Depression-Dejection subscale and the Beck Depression Inventory II, Reeves et al. measured patients’ depressed mood before the start of the experiment, after hour 1 of treatment, and after hour 2 of treatment. Researchers found a statistically significant decrease in self-rated depression scores after treatment from before starting the light therapy.  Multiple neurotransmitters, molecular compounds that neurons release in order to communicate with other neurons, are responsible for this rapid mood change. Upon light therapy stimulation, serotonin (a main neurotransmitter responsible for mood balance and involved in seasonal depression) was found to rise at a rate directly correlated to the amount of light administered (Reeves et al., 2012). Our long summer days in Paris allow for natural sessions of light therapy, which in turn leads to happier people.

Light on Attention

So now that I know why I feel happier, I also wondered if these lengthened spring nights in Paris could be having a reverse effect on my ability to concentrate on tasks rather than blaming my lack of motivation on an increasing infatuation with the “City of Love.” As we approach the longest day of the year during the summer solstice on June 21st, the day will be 7 hours and 56 minutes longer than it was when I arrived in the middle of winter (Sun and Moon, 2015). Not only am I staying outdoors longer, I’m going to bed 2-3 hours later than during the spring semester, while still waking up at the same hour as I did in winter. As the days lengthen and we stay more active, the potential for sleep deprivation and associated negative impacts on the brain’s ability to perform increase. Further, certain individuals can be more vulnerable to sleep deprivation, amplifying the resulting impact on performance and sleepiness (Chua et al., 2014). So, as we approach June 21st, I am reminded of the erratic behavior of the young lovers and comedic actors I saw in Shakespeare’s Midsummer Night’s Dream at La Comédie Française this April. Perhaps it wasn’t the meddlesome fairies after all, but rather neuroscience that would suggest they were vulnerable to sleep deprivation caused by the long summer day!

Le songe d’une nuit d’été à la Comédie Française/ Production of Shakespeare’s Midsummer Night’s Dream at the Comédie Française

Le songe d’une nuit d’été à la Comédie Française/ Production of Shakespeare’s Midsummer Night’s Dream at the Comédie Française

~ Amy Yeh

References

Chua EC-P, Yeo S-C, Lee IT-G, Tan L-C, Lau P, Cai S, Zhang X, Puvanendran K, Gooley J (2014) Sustained Attention Performance during Sleep Deprivation Associates with Instability in Behavior and Physiologic Measures at Baseline. Sleep 37(1): 27-39.

Jackson C, Capozzi M, Dai H, McMahon DG (2014) Circadian Perinatal Photoperiod Has Enduring Effects on Retinal Dopamine and Visual Function. The Journal of Neuroscience 34(13): 4627-4633.

Reeves G, Nijjar GV, Langenberg P, Johnson MA, Khabazghazvini B, Sleemi A, Vaswani D, Lapidus M, Manalai P, Tariq M, Acharya M, Cabassa J, Snitker S, Postolache TT (2012) Improvement in Depression Scores After 1 Hour of Light Therapy Treatment in Patients With Seasonal Affective Disorder. Journal of Nervous & Mental Disease 200 (1): 51–55.

Sun and Moon. (2015, May 1). In Time and Date. Retrieved from http://www.timeanddate.com/astronomy/france/paris

Lost in Paris

After exploring Paris for two weeks, I have come to love the sights, smells and tastes of its beautiful streets. I already found my favorite routes for traveling to class and finding new restaurants. I know where to go to find a quiet garden to study in, or a quaint little restaurant to have the most amazing gnocchi dinner. As I continue to wander around, my understanding of the layout of the city is coming together to form a cohesive picture. As any naïve tourist would report, I felt like a natural Parisian after my first successful solo excursion on the metro. And as that same naïve tourist would inevitably soon discover, I was not nearly as good at navigating as I assumed.

On one of my first days in Paris, I was lucky to be able to spend the afternoon with my boyfriend who was touring around Europe. At the end of the day, I wanted to go to a small restaurant in Montmartre that I visited over three years previously. I assumed I would easily be able to figure out the way once we got to Montmartre.

Patrick and me at the Louvre

Patrick and me at the Louvre

When we arrived at the metro line to go up to Montmartre, we found that it was closed, and a sign directed us to the next stop along the same line. We walked over and to our frustration, that stop was closed as well, with a sign directing us back down to where we had come from. Not ready to be discouraged, we decided to get on a different line at that station, and try to make connections until we were near our destination. Over an hour later, we found ourselves standing on an unfamiliar street, without wifi or any real idea of where we were. We oriented ourselves to walk north, since we had no better plan for how to begin.

All of our stops through Paris! The green dot shows the restaurant in Montmartre, the yellow dot shows the metro stop we got off at, and the blue dot shows where I started and ended my day. The red dots are all of the stops along the way.

All of our stops through Paris! The green dot shows the restaurant in Montmartre, the yellow dot shows the metro stop we got off at, and the blue dot shows where I started and ended my day. The red dots are all of the stops along the way.

Upon reflection, I realized that the only reason I managed to eventually eat dinner that night, was because of my ever-resourceful hippocampus. Well known for its role in memory consolidation, the hippocampal formation is now recognized to be highly involved in spatial navigation, in part due to the presence of grid cells and place cells (Jacobs, et al., 2013). Oscillations in place cell firing occur in a cycle called the theta cycle, to help orient oneself in space (Wikenheiser & Redish, 2015). Unlike place cells, which only fire for very specific locations in space, grid cells in the entorhinal cortex represent space in a triangular coordinate system (Jacobs, et al. 2013). Many research studies have explored the presence and function of place and grid cells in rodents, bats, and primates. One study showed that rats have a hippocampal cognitive map, representing specific objects in specific locations, and only secondarily focusing on object identity (Manns & Eichenbaum, 2009).

The hippocampus and the entorhinal cortex are both part of the hippocampal formation.  http://www.nature.com/nrn/journal/v12/n10/fig_tab/nrn3085_F1.html

The hippocampus and the entorhinal cortex are both part of the hippocampal formation.
http://www.nature.com/nrn/journal/v12/n10/fig_tab/nrn3085_F1.html

In a recent study, researchers directly obtained electrophysiological recordings from humans while they were undergoing treatment for epilepsy (Jacobs, et al. 2013). The subjects performed a virtual spatial learning task in between clinical procedures. The subjects used a joystick to navigate a virtual environment, and during testing they needed to travel directly from one object to an invisible goal object. Microelectrodes placed in the subject’s brain recorded neural activity throughout the task. The data provide evidence that humans, just like other mammals, have an allocentric spatial cognitive map, complete with grid cells and place cells. This means the location of one object is defined in relation to the location of others.

All of these data help to explain my journey to Montmartre. As I pictured myself walking through the area that I wished to go, my hippocampus fired to simulate the future, goal-directed action (Wikenheiser & Redish, 2015). Just as your place cells fire to represent where you are, they can also fire as you “replay” an experience in your mind. When I found the train platform closed, my interconnected hippocampus likely communicated with the reward center of my brain in the ventral striatum to link the failed expectation to the place (van der Meer, & Redish, 2009). Once I started navigating through the highly unfamiliar area, the neurons in my hippocampus and entorhinal cortex must have fired in an effort to link novel stimuli to spatial context. Evidence suggests that my instinct to “walk north” was because exploration relies heavily on grid-cells with direction sensitivity (Jacobs, et al. 2013). As the scenery around me started to become more familiar, specific cells throughout my hippocampal formation responded to locations, landmarks, and directions that triggered unique firing patterns (Jacobs, et al. 2013). Once I arrived at my final destination, my hippocampal neurons would have fired to help many areas of my brain realize that this restaurant was familiar, and that I should soon expect a reward in the form of delicious French food.

Well worth the wait

Well worth the journey

I am looking forward to many more adventures through Paris, and I now know much more about how my hippocampus can dependably orient me in space. I also learned that I probably should start carrying a map.

References

Jacobs J, Weidemann CT, Miller JF, Solway A, Burke JF, Wei X, Suthana N, Sperling MR, Sharan AD, Fried T, & Kahana MJ, (2013). Direct Recordings of grid-like neuronal activity in human spatial navigation. Nature Neuroscience. 16(9):1188-1190

Manns JR, & Eichenbaum H, (2009). A cognitive map for object memory in the hippocampus. Learning & Memory. 16:616-624.

van der Meer MAA, Redish AD, (2009) Covert expectation-of-reward in rat ventral striatum at decision points. Front Integr Neurosci. 3:1-15.

Wikenheiser AM, & Redish AD, (2015). Decoding the cognitive map: ensemble hippocampal sequences and decision making. Current Opinion in Neurobiology. 32:8-15.

Image

Up In Smoke

In Paris, €5.90 will buy you one the following: conditioner, flip flops, a mozzarella sandwich or a single pack of Lucky Strike cigarettes. Beyond the opulent architecture and elegant skyline, smoke was the first thing I noticed as I wandered the picturesque streets of my new home. Cigarettes in the hands of teenagers, waiters, lawyers, mothers, and ironically, and even medical students with immunology textbooks tucked under their arms. When I asked a local friend about his general smoking habits, his response surprised me:

Well, I guess the first time I tried it was when I was 12 – all my friends were doing it after all. Now, I just need to smoke… if I don’t, I get anxious and irritated.

Twelve-years old and already smoking, how could that be possible? However, my Parisian friend is not alone. In fact, according to CDC studies, among daily smokers, 88% begin before the age of 18 (National Center, 2012). With such a large well-known body of evidence detailing the physiological and psychological consequences of tobacco and nicotine, why would a teenager reach for a cigarette in the first place?

(The National Center, 2012)

Age of Onset of Smoking

The “big picture” mechanisms of smoking seem pretty straight forward. Cigarettes contain tobacco, which in turn contains nicotine, which in turn triggers the addiction process. Addiction, or compulsive use of a substance in the face of negative consequences, is characterized by four distinct stages: introduction, sensitization, association/craving and dependence (Herman et al., 2014). However, the reasons behind why adolescents like the chain-smoking Parisian teens in particular are so vulnerable to nicotine are less understood.

One recent theory, published in Neuroscience by researchers Bang and Commons, examined the role of nicotine on the adolescent serotonin system. Serotonin (aka 5-HT) is a chemical released by neurons in the brain, and may contribute to starting and continuing addictive behavior. Based on previous research, Bang and Commons (2011) hypothesized that if they gave adolescent subjects nicotine, there would be changes in the activation of their serotonin neurons.

In the experiment, the researchers used eight groups of rats total – four with adolescents and four with adults. For both ages, three of the groups served as experimental (test) groups, and each group member received an injection of a specific dose (amount) of nicotine (0.2, 0.4, 0.8 mg/kg). The fourth group served a baseline/control group and received saline (salt water) instead of nicotine.

After humanely killing the animals, the researchers cut frontal slices each rat brain and used a process called immunohistochemistry to chemically mark the brain for specific proteins. The researchers specifically stained and measured the amount of Fos protein in brain areas important in the serotonin system (dorsal raphe and median raphe nuclei). The Fos protein corresponds to biochemical activity, so if nicotine changed or increased activity in the serotonin system, the researchers would observe increased Fos levels in comparison to the normal levels of the saline control group.

When comparing the adolescent and adult group, the researchers concluded that adolescents showed an increased, widespread activation of their brain serotonin system at the lowest (0.2mg/kg) and highest nicotine dosage (0.8mg/kg). On a larger scale, these results indicate that the adolescent serotonin system may be more sensitive to an initial exposure to nicotine. Though there needs to be more research defining the serotonin system’s role in addiction, this study helps elucidate the science behind adolescent nicotine vulnerability.

Arrows Indicate Fos Staining

Arrows Indicate Fos Staining

Somehow, (and for the sanctity of my lungs) we need to stop teens from trying cigarettes in the first place. Based on the failure of smoking bans in France and the amount of smokers I saw on a daily basis, this is easier said than done.  Research indicates that pervasiveness and social support of smoking in adolescent social networks is strongly associated with both susceptibility AND readiness to quit (Roberts et al., 2015). To relate to my own experience, none of my friends at home or on the trip smoke, so it was easy to turn down a cigarette when I was offered.

These are ALL Tobacco Shops

These are ALL Tobacco Shops in Paris

In the future, perhaps France should take after the example of the highly successful American “Truth” association, which uses the celebrity-endorsed #FINISHIT social media campaign to raise awareness about teen smoking. Until then, I’ll concede to duck around smoke clouds and spend my €5.90 on some much needed fabric Fabreze.

http://www.youtube.com/watch?v=CNS0JaX9_X8

References:

Bang SJ, Commons KG (2011) Age-dependent effects of initial exposure to nicotine on serotonin neurons. Neuroscience 179:1-8.

Herman Al. DeVito EE, Jensen KP, Sofuoglo ME (2014) Pharmacogenetics of nicotine addiction: role of dopamine. Pharmacogenomics 15(2):221-34.

Khan, Maria. “France: First Outdoor Public Smoking Ban in Paris Playground.” International Business Times. 20 Oct. 2014. Web. 7 Jun. 2015.

National Center for Chronic Disease Prevention and Health Promotion (US) Office on Smoking and Health. Preventing Tobacco Use Among Youth and Young Adults: A Report of the Surgeon General. Atlanta (GA): Centers for Disease Control and Prevention (US); 2012. 3, The Epidemiology of Tobacco Use Among Young People in the United States and Worldwide.

Roberts ME, Nargiso JE, Gaitonde LB, Stanton CA, Colby SM (2015) Adolescent social networks: general and smoking specific characteristics associated with smoking. J Stud Alcohol Drugs 76(2):247-55

Truthorange. “Finshers 2014 | truth.” Online video clip. Youtube. Youtubem 10 Aug. 2014. Web. 7 Jun. 2015.

Beauty is in the Eye of the Beholder: Paris Edition

Dear Friend,

What is it about quintessential European cities that tenderly pulls at our heartstrings and calls to us? For me, it is the simple art and beauty sprinkled throughout the cities, hidden in almost every little detail. This is my second time and Paris, and after stepping out of my dorm in Cité and catching the Métro to the heart of the city, I found myself in awe while exiting the station at Saint-Michel-Notre Dame, reveling at the scene around me. As I walked around the City of Light, brimming with art and culture, I made a mental note of the places that I wanted to visit.

Finally, when the first weekend crept around the corner, some of my friends and I decided to take advantage of the leisure time we had and partake in touristy activities around Paris. After making a brief stop at the Latin Quarter to grab a quick bite, recharging ourselves, we headed to Notre Dame. Upon arrival, the hordes of people faded into the background, and I marveled at the grand façade of the cathedral before me, still standing tall and strong. It’s hard to believe that Notre Dame is over 800 years old!

The bells (though not ringing) of Notre Dame!

The bells (though not ringing) of Notre Dame!

Upon following the throng of people into the cathedral, we were hit by a peaceful silence that really allowed us to soak in the scene encompassing us. We strolled along the pews, pausing here and there to appreciate the curves and contours crafted into the stone, scattered with a multitude of stained glass windows here and there.

The glorious Notre Dame from inside.

The glorious Notre Dame from inside.

We spent a good thirty minutes inside the church before deciding to proceed with the tower climb. However, after waiting in the shade for a grueling hour and barely moving an inch in line, we made a quick change of plans and headed to the gothic chapel Sainte-Chapelle, a hidden gem which houses some of the most important relics of Christianity. The chapel is embedded from plain sight by the Palais de Justice and just a mere five minute walk away from Notre Dame. We were able to get inside (much faster than waiting in line for the tower!) and boy, was it rewarding. I was awestruck by the architectural beauty, though this one was different than Notre Dame’s. Stained glass windows lined every wall, detailing stories encrypted in the Bible.

Stained glass windows encompassing Sainte-Chapelle.

Stained glass windows encompassing Sainte-Chapelle.

After seeing both Notre Dame and Sainte-Chapelle, I was intrigued by how appreciative my friends and I were of such places, and this piqued my interest, so I decided to do a little research. I came across a rising field in architecture that combines neuroscience and beauty: neuroaesthetics. Neuroaesthetics has become increasingly popular and focuses on the neural processes involved with our perception and interpretation of finding works of art aesthetically pleasing (Leder 2013). Our intuitions that explain how we feel can be reflected in physical features around us (Vartanian et al., 2013), which could explain why we all felt at peace while walking among the churches.

Appreciating the beauty of Sainte-Chapelle, while not yet knowing the mechanism of how this happens.

Appreciating the beauty of Sainte-Chapelle, while not yet knowing the mechanism of how this happens.

More recent theories involve how such architectural designs can lead to particular behavioral outcomes. After further research, I found an article regarding the effect of architectural contour lines on aesthetic judgments. The researchers hypothesized that more curvaceous structures were more likely beautiful and cause people to enter them. They further postulated reward pathways within the brain triggered judgments in response to aesthetically pleasing objects (Vartnanian et al., 2013).

In order to test their predictions, experimenters placed participants in a functional magnetic resonance imaging (fMRI) scanner and presented images of varying contour designs. The researchers then asked participants two questions regarding the image: whether or not it was beautiful. The images portrayed rooms that had many curves (curvilinear) or straight lines (rectilinear), and within these they had either high or low ceilings and were open or enclosed spaces.

So what did this study find? Behaviorally speaking, participants rated the curvilinear spaces more beautiful and pleasant to look at than the rectilinear ones, though contour did not have any effect on approach-avoidance decisions. At a neural level, curvilinear structures activated the anterior cingulate cortex (ACC) of the brain, which previously proved its involvement in processing aesthetic images (Brown et al., 2011). The ACC, in turn, is connected reward processing via the main reward mechanism system in the brain, the orbitofrontal cortex (OFC). The findings therefore show that humans find that curvier structures are visually appealing and linked through the reward system in the brain.

How does all this research relate to the various buildings I’ve seen throughout Paris? Well, most of the interior in Notre Dame and Sainte-Chapelle were curvilinear, which explains why I felt blissful while absorbing the scene around me. That being said, we can still find rectilinear structures pleasant to view. Take the controversial pyramid outside the Louvre, for instance. Though it represents a clash between old and new, it possesses its own unique beauty.

Next architectural wonder: the Louvre!

Next architectural wonder: the Louvre!

And that takes me to where I will hopefully be heading in my next journey through Paris! After spending a day doing homework at the beautiful Jardin des Tuileries just the other day, a few of us made a quick stop to check out the Louvre. We have not been in yet, but we shall go in soon, all in due time.

That’s it for now. I’ll talk to you later!

Sincerely,

Kaavya Mandi

References:

Brown S, Gao X, Tisdelle L, Eickhoff SB, Liotti M (2011) Naturalizing aesthetics: Brain areas for aesthetic appraisal across sensory modalities. Neuroimage 58(1):250–258.

Leder H (2013). Next steps in neuroaesthetics: which processes and processing stages to study?. Psychology of Aesthetics, Creativity, and the Arts 7(1): 27-37.

Vartanian O, Navarrete G, Chatterjee A, Fich LB, Leder H, Modroño C, Nadal M, Rostrup N, Skov M (2013) Impact of contour on aesthetic judgments and approach-avoidance decisions in architecture. PNAS 110: 10445-10453.

An All-Natural High: Running through Paris

Bonjour tout le monde!

As my second week in Paris comes to a close, I can’t help but reflect on my time in Paris thus far. Have I accomplished what I’ve wanted to accomplish? Have I met my goals?

One major goal that I set out to fulfill during my time in Paris was to keep running. But before I delve into that, let me give you a little background on my relationship with running.

I never used to enjoy running. In fact, I strongly disliked running. My parents have always been big runners and have run marathons, done triathlons, Tough Mudder-type events, and many others. I could never understand why they would put themselves through the grueling process of burning up your lungs and muscles until you just couldn’t do it anymore. Why subject your body to that much pain? All throughout middle school and high school, the only running I did was on the soccer field or on the volleyball court. But that all changed this past semester.

I can’t tell you for sure what it was that changed my mind about running. To be honest, I think it might’ve been that I wanted to get in shape and I knew running would get me there. So I started running. Every other day, every few days… whenever I found time in my busy Emory schedule to run, I ran. And it got easier each time. I didn’t feel as fatigued when I ran, and the thought of running didn’t incur feelings of immense hatred anymore. I actually started to enjoy it… even look forward to it! You’re now reading the blog post of a girl who is signed up to run a half marathon in the fall, and I couldn’t be more excited about training for it.

While I haven’t had much time to run in Paris between classes, excursions, and exploring, I’ve tried to fit it into my schedule as much as I can, even if it’s  just a short, 2 mile run. The first time I went for a run in Paris, I immediately felt better and had an immediate rush of familiar excitement. As I set off to run in one of my favorite places in Paris, the Touileries garden, pounding along to the beat of “‘Till I Collapse” by Eminem, I finally identified the feeling. It was an all-natural, all-encompassing high.

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Beginning my run in the Touileries (photographed by Joy Lee)

As I entered the park and continued along the path, feeling great, I wondered what caused this high, and how it affected my running performance.

So I came back to my room later that day and did a little bit of research. I found a study from 2008 that described the phenomenon I was experiencing, called “the runner’s high”. This study by Boecker et al. (2008) looked at ten athletes at two time intervals: one after 2 hours of endurance running and one during a rest period. The researchers looked at whether particular opioid receptors (molecules of tissue that bind substances called endorphins that give us a boost when we run) get depleted when we run long distances, and they indeed found that certain areas of the brain do in fact have reduced opioid receptor availability in subjects during endurance running as compared to when subjects were resting!

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Reduction in opioid receptor availability in certain areas of the brain after long distance running compared to when resting

So basically, when we run long distances, we do in fact feel an all-natural “high”, in addition to having pain-relieving symptoms — even though it often feels like we’re about to die when we’ve run for too long (Boecker et al., 2008).

This analgesic effect got me thinking though: what about when we’re extremely fatigued? We don’t seem to feel this pain-killing effect anymore: in fact, the pain is almost unbearable when we feel like we’ve reached our limit. The concept of limits reminded me of a Radiolab podcast that I had listened to while taking Human Physiology with Dr. Cafferty, fall semester 2014. In the beginning of the podcast, Jad Abumrad and Robert Krulwich (the hosts of Radiolab) introduce Julie Moss, who discusses her first Ironman experience. If you watch her running toward the finish line on YouTube, you can see how the fatigue after swimming 2.4 miles, biking 112 miles, and finally a marathon (26.2 miles) truly catches up to her.

https://www.youtube.com/watch?v=VbWsQMabczM

Krulwich and Abumrad then go on to introduce what is known as the central governor theory, along with the help of physiologist Dr. David Jones. This theory describes how fatigue may in fact not be a result of muscles running out of energy: in fact, it may be more mental than we think. When we’re running low on energy, this central governor signals triggers of pain to try to get us to rest. Scientists are finding that this governor circuit is conservative, keeping a reservoir of energy readily available in case of an emergency. While some scientists argue that fatigue is one of the greatest imperfections of the body, Noakes (2012) references an Italian physiologist A. Mosso who says that fatigue may in fact be one of of our most marvelous perfections. As Krulwich jokes in the Radiolab podcast, perhaps fatigue is our body’s “almost out of gas” message, telling us we’re running out of energy when we still have a 1/4 of a tank left.

As I continue to train and eventually complete the half marathon in the fall, I know I’ll be thinking about my central governor and hoping for that endorphin boost; especially as I (hopefully) run toward that finish line, trying to avoid pulling a Julie Moss, running to the melody of Chariots of Fire.

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Selfie of me while running in Montsouris park!

Until next time,

Meg

References:

Abumrad J, Krulwich R. Limits of the Body. RadioLab. http://www.radiolab.org/story/91710-limits-of-the-body/

Boecker H, Sprenger T, Spilker, M, Henriksen G, Koppenhoefer M, Wagner, KJ, Valet M, Berthele A, Tolle T (2008). The Runner’s High: Opioidergic Mechanisms in the Human Brain. Cerebral Cortex 18: 2523-2531.

Noakes T (2012). Fatigue is a Brain-Derived Emotion that Regulates the Exercise Behavior to Ensure the Protection of Whole Body Homeostasis. Front Physiol. 3:82.

“Hello” or “Bonjour” ?

Hello world,

This past week has been extremely interesting, yet exciting, to say the least. After a TERRIBLE delay at JFK airport, I finally made it to Paris (about 6 hours behind schedule…). Once settled into my room, I met up with my friend, Sasha, to grab a quick dinner. We decided to go to a small restaurant close to where we live, as our long day of traveling left us extremely tired. When we sat down at the restaurant, the waiter walked over and said, “Bonjour, comment puis-je vous aider?” This caught me extremely off guard, as this was the first time I engaged in a conversation with a true francophone.

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Sasha (left) and me (right) at dinner

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Sasha and me at the Eiffel Tower

 

Let me rewind a little bit. I have studied French since 6th grade, and although it may not be my primary concentration in college, it plays a huge role in my academic career. However, this was my first time in a French speaking country, so I have not had much experience with French conversation, aside from with my fellow French-speaking peers and professors. So, when the waiter confronted me and asked a question in French, I was rightfully so caught off guard.

 

 

(Anyway, returning to the restaurant…) Sasha, being from Montreal and growing up speaking French with her family, swiftly answered the waiter. After a few seconds of gathering myself and adjusting my vocabulary, I too answered him (in French, of course). This event made wonder what physiological differences, if any, occurred in my brain when switching between English and French vocabulary. Were different areas of my brain active for French words versus English words and vice versa? This question sparked my interest, so, upon returning to my room I searched for an answer.

Before I try and explain the studies I found, let me give you a quick and easy lesson concerning neuroscience and language. Broca’s area, a region of the frontal part of the brain, is linked to the production of speech, while Wernicke’s area, a region of the temporal part of the brain (slightly above where your ears are), is linked to the comprehension aspects of speech. In order to engage in a coherent conversation with another individual, one must use both of these areas, as the language one hears must be understood
(via Wetumblr_memuxuR4xw1qf721rrnicke’s area) and the language one speaks must be intelligible (via Broca’s area). So, when looking for an answer to my original question about language, I immediately thought that this must be the sole system affected, but boy was I wrong.

 

After some quick searching, I stumbled upon an article by Correia et al., 2014, concerning brain activation in bilingual individuals. The researchers in this study subjected bilingual participants, fluent in English and Dutch, to a series of experimentations in which the participants were placed inside an fMRI and told to listen to a series of words. The words consisted of the names of specific animal species, and the language spoken varied between English and Dutch. The fMRI constructed images of the participant’s brains, highlighting the regions most active during this process. By examining and comparing the fMRI images created by solely Dutch words, solely English words, and a combination of the two, Correia et al. isolated several regions of the brain active for both languages. The main region of activity they observed was the anterior temporal lobe (ATL). This cortical region is associated with semantic memory, that is, memory of physical objects, people, information, and (most important to this study) words (Bonner and Price, 2013). This finding is significant as it provides evidence that semantic knowledge is processed in a language-independent form in the brains of bilingual listeners (Correia et al., 2014). Essentially, this means that as the participants listened the either English or Dutch words, their ATLs become equivalently active for each. So, when I was in the restaurant with Sasha, although I may have been caught off guard by the waiter speaking French, similar regions of my brain became active compared to if the waiter spoke English to me.

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A figure from Correia et al. (2014) depicting the language-independent regions of the brain, one of which being the anterior temporal lobe (ATL)

Another interesting study I found was conducted by Mohades et al. in 2012. In this study, the researchers assessed the brain circuitry associated with language in children aged 8-11 years old. They compared this circuitry in children raised monolingual to those raised bilingual. Through this, the researchers discovered significantly different white matter density in specific brain regions involved with spoken language and comprehension of language. Certain areas of bilingual’s brains contained different densities of white matter in comparison to the brain’s of monolinguals (Mohades et al., 2012). This means that the circuitry of the brain involved with language differs depending on one’s language capabilities. So, in relation to my brain and Sasha’s brain, we have different densities of white matter in specific regions of our brains, since Sasha was raised bilingual (woah).

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The type of fMRI imaging used by Mohades et al. (2011) to measure white matter integrity (density).

 

I found both of these articles very interesting because they offer different findings regarding brain activation in bilinguals. In my NBB classes I learn about many regions of the brain discussed in these studies, yet I never knew the role they played in bilingual individuals. With this newfound knowledge, I am interested in doing further research to discover more differences in brain activation associated with language.

~ Ethan Siegel

References

Bonner M, Price A (2013) Where is the anterior temporal lobe and what does it do? The Journal of Neuroscience. 33(10): 4213-4215

Correia J, Formisano E, Valente G, Hausfeld L, Jansma B, Bonte M (2014) Brain-based translation: fMRI decoding of spoken words in bilinguals reveals language-independent semantic representations in anterior temporal lobe. The Journal of Neuroscience. 34(1):332–338

Mohades S, Struys E, Van Schuerbeek P, Mondt K, Van de Craen P, Luypaert R (2011) DTI reveals structural differences in white matter tracts between bilingual and monolingual children. SciVerse ScienceDirect. 1435: 72-80

Confession of a Paris rookie: I talk to strangers.

Dear Mom & Dad,

Not gonna lie, I have been talking to strangers despite your safety warnings about pick-pocketers and creepers. To my pleasant surprise, all my stranger-interactions have been positive. Maybe it’s due to the special neural network that relates empathy and strangers (Rameson, 2012). I gave a lost French lady directions to the metro, and couple of days later, this guy gave me directions to Notre Dame. I also ran into a group of French military students who were thrilled to see Americans. I wish I could capture all these moments as accurate as possible, but sadly, the dynamic nature of memories and their vulnerability to change makes such task extremely difficult (Yates, 2011). Regardless, Paris and I have been getting along just fine.

stranger danger at Notre Dame? 1st year French military students studying engineering.

You probably would have had a heart attack at fete de la musique aka a place full of strangers and music. It’s a giant music festival in France to celebrate the first day of summer. Paris was the perfect place to roam around the streets filled with music of all genre ranging from the blues, electronic, orchestral, chorale, and rock. Unfortunately, I did get lost from the NBB crew because I was too absorbed listening to these drummers. Music has this universal constant where everyone can derive meaning from it, unlike foreign languages (Demorest et al, 2010).

 oh, the places I went!

You are probably thinking… great. My daughter is wandering around Paris staring at strange faces and listening to ten types of music. I understand your confusion, but I assure you that the tuition money is not going to waste. I’ve been trying to integrate all my sensory information, especially in seeing and listening. There seems to be relationship in background music and memory for facial expression (Wolozyn and Ewert 2012). This study aimed to investigate how happy or sad melodies affected the later recall of facial expression.

officially the cutest musician in Paris

So, what exactly happened in the study? 48 undergraduates (32 females & 16 males) were recruited for the study. There were two sessions: study phase and test phase. From the beginning, they were told that there would be a memory test during the second session. During the study phase, they viewed a series 42 simple line drawings with accompanying background music (happy or sad or no music). The drawing was a child either laughing (happy) or frowning (sad) in various backgrounds. Using plain drawings was important since it eliminated other possible recognition cues, such as physical attractiveness or distinct facial features, that could have been used during the memory recall test. The background music clips (happy or sad), were from a standardized set of emotional music only consisting of a digital piano. In addition to the key (major or minor), the type of music differed in its tempo. Happy music was in the faster range (110-140 beats per minute, BPM) while the sad music fell in the slower range (66 – 110 BPM). Each illustration and its accompanying music was presented for 7 seconds to keep the presentation duration constant with two second intervals. From this arrangement, there were six stimulus types by varying the facial expression and the music type. (happy or sad + happy or sad or no music)

Summary of study phase conditions:

  • a series of 42 simple drawings (happy or sad) for 7 seconds with 2 intervals
  • with accompanying music in the background (happy or sad or no music)

happy or sad? the drawing used in the study

During the test phase, the 42 drawings were presented again with only the face blanked out, and there was no accompanying music. The participants had to recall if the blank face was happy or sad. If they could not remember the facial expression, they were told to guess.

Overall, the memory for faces was accurate, but the most intriguing part of the data is in the performance of the emotionally incongruent pairs (ex. happy face with sad music), which showed the lowest performace. The subjects recalled happy face as sad when it was accompanied by sad music and sad face as happy when accompanied by happy music. From this data and other similar studies, the researchers speculate that when recalling a scene, the emotional tone is set by stimulus from other senses (Eschrich, 2008 and Wolozyn and Ewert 2012). However, it’s important to note that the primary goal of the research was to study the memory retrieval of facial expression in various melodies and not on how background music influences one’s arousal or mood, although this may explain why the subjects were better at recalling the emotionally congruent pairs.

notice the drop in the performance with the emotionally incongruent music

Interestingly, movies seem to be the realistic application behind this idea since they show many faces and situations paired with different music. Soundtracks have the ability to alter how the audience perceives the characters (Hoeckner et al, 2011). This idea of the emotional integration between face and music is equally represented in non-musicians and musicians, which suggests that this integration is not affected by individual musical training (Kamiyama et al., 2013). Additionally, patients with certain brain damages have hinted at some possible regions involving the association of music and facial expression. People with excision to the anteromedial temporal lobe showed impairment in their ability to recognized scary music and fearful faces (Gosselin et al, 2011).

All these different studies strongly suggest that there is a neural relationship between faces and music. This could partially explain why I have such happy thoughts when recalling fete de la musique. I know that in my inevitable nostalgia of the NBB Paris program, I will be seeing smiling faces with up beat music. So next time you meet someone, shine a beautiful smile and blast some happy tunes.

happy faces + happy music first group of strangers I met after getting lost.

References

Demorest SM, Morrison SJ, Stambaugh LA, Beken M, Richards TL, Johnson C. (2010) An fMRI investigation of the cultural specificity of music memory.

Gosselin N, Peretz I, Hasboun D, Baulac M, Samson S. (2011) Impaired recognition of musical emotions and facial expressions following anteromedial temporal lobe excision. Cortex 47: 1116 – -1125.

Hoeckner B, Wyatt EW, Decety J, Nusbaum H. (2010) Film music influences how viewers relate to movie characters. Psychology of Aesthetics, creativity, and the arts 5: 146 – 153

Kamiyama KS, Abla D, Iwanaga K, Okanoya K. (2013) Interaction between musical emotion and facial expression as measured by event-related potentials. Neuropsychologia 51: 500 – 505

Meyer ML, Mastern CL, Ma Y, Wang C, Shi Z, Eisenberger NI, Han H. (2012) Empathy for the social suffering of friends and strangers recruits distinct patterns of brain activation. Social cognitive and affective neuroscience

Rameson LT, Morelli SA, Lieberman MD. (2012) The neural correlates of empathy: experience, automaticity, and prosocial behavior. Journal of cognitive neuroscience 24: 235 – 245.

Woloszyn MR, Ewert L. (2012) Memory for facial expression is influenced by the background music playing during study. Advances in cognitive psychology 8: 226 – 233.

Yates D. (2011) Learning and memory: parallel processing. Nature reviews neuroscience 12:488

What a light weight …

Last night Sehe, Kris decided to wander around for dinner and ended up finding a fantastic little pizza place called Café l’Éphémère.

Map of Café l’Éphémère

It was happy hour so we all got our own cocktail, mine being the pinkest drink I’ve ever ordered.

My Tequila Sunrise

The pizza was delicious and the escargot was definitely interesting, but my favorite part was seeing how the same amount of alcohol affected each of us in a different way.  My tequila sunrise did not affect me and Sehe’s French martini had little effect on her, but Kris on the other hand, was definitely feeling his vin chaud.  Why was it that even though we all drank the same amount, he was the one that was telling stories about “the good ol’ days” (he’s only 25…) and taking “artsy” pictures with the coaster and candle.  I decided to look it up when I got back.

Even though most research was centered on chronic consumption with reference to alcoholism, I did find a paper that was particularly interesting concerning alcohol sensitivity.  Often we say, “that person has a low tolerance” when they are easily affected by alcohol, however they are actually just more sensitive to alcohol’s effects .Tolerance is often defined as when the body becomes accustomed and less responsive to a substance (like alcohol) after repeated exposure(Webster, 2013).  You can have less of a response to alcohol without the repeated exposure.  Essentially, Kris was more sensitive to the effects of alcohol then Sehe and I.

The paper I found was Wargelius et. al, 2010 and it links 5-HIAA (a metabolite of serotonin) in the cerebrospinal fluid (CSF) and MAO-B with alcohol sensitivity in rhesus monkeys.  MAO-B is a mono amine oxidase, which breaks down monoamines (like serotonin).  It is often found in neurons and blood platelets. What was significant about this particular study was that it was one of the firsts to link MAO-B activity with sensitivity to the effects of alcohol.  (Wargelius et al., 2010).

Wargelius et al. had 78 rhesus monkeys receive an ethanol solution and after they were scored for their degree of intoxication (whether they fell, bumped a wall, or swayed).  They tested voluntary alcohol intake by having the animals participate in a procedure where they were able to choose between an ethanol solution, aspartame, and water for 5 days during a two week period.  They also took CSF and blood samples in order to test for 5-HIAA levels and platelet MAO-B activity.

They found that rhesus monkeys that had low platelet MAO-B activity also had low levels of 5-HIAA and were less sensitive to the effects of alcohol.  Interestingly, those with low platelet MAO-B activity also had more ethanol-induced aggression and higher voluntary alcohol intake.  These results combined with the knowledge that lower activity of MAO is related to behavior and psychiatric disorders, could suggest that individuals with low platelet MAO-B activity are more susceptible to alcoholism (Oreland, 2004; Wargelius et al., 2010).

I found this study very interesting because I really liked how it suggested a link between low MAO activity and high alcohol sensitivity.  In our NBB classes we are always talking about MAO activity in relation to various different psychological disorders.  However, since this one of the first papers to make this connection, it will be interesting to see if further research backs up their results.

~Sarah Harrington

 

Oreland L (2004) Platelet monoamine oxidase, personality and alcoholism: the rise, fall and resurrection. Neurotoxicology 25:79-89.

Wargelius HL, Fahlke C, Suomi SJ, Oreland L, Higley JD (2010) Platelet monoamine oxidase activity predicts alcohol sensitivity and voluntary alcohol intake in rhesus monkeys. Upsala journal of medical sciences 115:49-55.

Webster M (2013) Tolerance. In: Merriam-Webster.com.