Groups clapping in unison undergo size-dependent error-induced frequency increase.

Area of Science:

• Collective behavior
• Emergent synchrony
• Human interaction dynamics

Background:

• Synchronized human behavior, like group clapping, is a common phenomenon.
• Previous understanding lacked a clear mechanistic explanation for frequency changes in such groups.

Purpose of the Study:

• To investigate the underlying mechanisms driving frequency increases in synchronized group clapping.
• To determine if individual tendencies or inter-individual interactions explain collective synchrony.

Main Methods:

• Experimental observation of clapping synchrony in groups of varying sizes (2-hundreds).
• Individual-based experiments and computational modeling to test hypotheses.
• Development of a coupled oscillator model simulating auditory interaction.

Main Results:

• Group clapping frequency consistently increased, with larger groups showing faster increases.
• Individual tendency to rush was experimentally ruled out as the primary cause.
• Asymmetric auditory sensitivity, where individuals react more to preceding claps, explains the frequency rise.

Conclusions:

• Collective frequency increase in synchronized clapping is driven by inter-individual auditory interactions correcting timing errors.
• A simple coupled oscillator model accurately replicates experimental observations of emergent synchrony.
• Asymmetric feedback loops are key to maintaining unison and driving collective frequency changes.