By Maryna Mullerman ‘20 A smile is often associated with positive feedback and friendly gestures. Jared D. Martin and researchers from the University of Wisconsin-Madison aimed to reevaluate this nonverbal social tool. They suggested that there are three distinct smiles that could be encountered —  reward, affiliation, and dominance — with each smile playing a different role in human society. Verbal communication activates the hypothalamic-pituitary-adrenal … Continue reading Functionally Different Smiles Cause Distinct Physiological Responses in Humans