What is biological motion? Define stimuli and paradigms. How do humans identify familiar activities and gestures which is useful for social interaction?

What is biological motion? Define stimuli and paradigms. How do humans identify familiar activities and gestures which is useful for social interaction?
Any amount of sources; no limits. Any sources, EXCEPT for websites, no websites sources.
APA writing style, times Roman numeral, 12 font, double spaced.

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