Investigating Humor in Social Interaction in People With Intellectual Disabilities: A Systematic Review of the Literature.

( 2011 ) in a study of the effects of familiarity and eye contact on the social behaviors of people with Angelman syndrome found that although they were the most variable social behaviors observed, more laughing/smiling was observed with familiar contacts when eye contact was maintained, though this finding did not reach statistical significance, likely due to the small sample size ( N = 15) in the study.

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