During a listening experiment, participants identified tickling-induced laughter with around 60% accuracy, confirming its distinct acoustic and perceptual characteristics compared to other laughter types.
The researchers from the University of Amsterdam emphasized that laughing is one of the first complex social behaviors humans exhibit, starting within weeks after birth.
Ticklish laughter exhibits less vocal control than other laughter types, and participants rated it as more involuntary, suggesting it may be an automatic response.
The findings suggest that laughter, particularly in response to tickling, has deep evolutionary roots, serving potentially as a defensive mechanism in sensitive areas.
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