Hand clapping is ubiquitous behavior for humans across time and cultures, serving many different purposes: to signify approval with applause, for instance, or to keep time to music. Acousticians often ...

One readily noticeable pathognomonic trait of autism is hand-flapping—a stereotyped motor movement that can look a bit like an attempt to accelerating the drying of nail polish. Not all with autism do ...

Social contagion If you wish to avoid the social faux pas of clapping at the wrong time, listen carefully to the volume of noise around you. That's the conclusion of a study about the social dynamics ...