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Leslie Seltzer's research showed that girls had a de-stressing response (i.e. increase in oxytocin levels) to hearing their mother's voices, but they did not get a similar response when receiving their text messages.
Both men and women respond positively to non-sexual physical touching by women. Touching by men has no effect.
Michael Kraus, Cassy Huang, and Dacher Keltner's 2010 study on NBA players high-fiving showed that teams where players touched each other more (e.g. high fives, fist bumps, etc.) performed better.
Participants playing the Prisoner's Dilemma are more likely to cooperate when touched gently.
- Robert Kurzban. "The Social Psychophysics of Cooperation: Nonverbal Communication in a Public Goods Game." Journal of Nonverbal Behavior 25(4), Winter 2001.
- Adam Hoffman. "How Awe Makes Us Generous." Greater Good Magazine. August 3, 2015.