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Short alleles, bigger smiles? The effect of 5-HTTLPR on positive emotional expressions.

Authors:
Claudia M Haase Ursula Beermann Laura R Saslow Michelle N Shiota Sarina R Saturn Sandy J Lwi James J Casey Nguyen K Nguyen Patrick K Whalen Dacher Keltner Robert W Levenson

Emotion 2015 Aug 1;15(4):438-48. Epub 2015 Jun 1.

Department of Psychology and Institute for Personality and Social Research, University of California, Berkeley.

The present research examined the effect of the 5-HTTLPR polymorphism in the serotonin transporter gene on objectively coded positive emotional expressions (i.e., laughing and smiling behavior objectively coded using the Facial Action Coding System). Three studies with independent samples of participants were conducted. Study 1 examined young adults watching still cartoons. Study 2 examined young, middle-aged, and older adults watching a thematically ambiguous yet subtly amusing film clip. Study 3 examined middle-aged and older spouses discussing an area of marital conflict (that typically produces both positive and negative emotion). Aggregating data across studies, results showed that the short allele of 5-HTTLPR predicted heightened positive emotional expressions. Results remained stable when controlling for age, gender, ethnicity, and depressive symptoms. These findings are consistent with the notion that the short allele of 5-HTTLPR functions as an emotion amplifier, which may confer heightened susceptibility to environmental conditions.

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http://dx.doi.org/10.1037/emo0000074DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4861141PMC
August 2015

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