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Social synchronicity
Date:12/13/2012

PASADENA, Calif.Humans have a tendency to spontaneously synchronize their movements. For example, the footsteps of two friends walking together may synchronize, although neither individual is consciously aware that it is happening. Similarly, the clapping hands of an audience will naturally fall into synch. Although this type of synchronous body movement has been observed widely, its neurological mechanism and its role in social interactions remain obscure. In a new study, led by cognitive neuroscientists at the California Institute of Technology (Caltech), researchers found that body-movement synchronization between two participants increases following a short session of cooperative training, suggesting that our ability to synchronize body movements is a measurable indicator of social interaction.

"Our findings may provide a powerful tool for identifying the neural underpinnings of both normal social interactions and impaired social interactions, such as the deficits that are often associated with autism," says Shinsuke Shimojo, Gertrude Baltimore Professor of Experimental Psychology at Caltech and senior author of the study.

Shimojo, along with former postdoctoral scholar Kyongsik Yun, and Katsumi Watanabe, an associate professor at the University of Tokyo, presented their work in a paper published December 11 in Scientific Reports, an online and open-access journal from the Nature Publishing Group.

For their study, the team evaluated the hypothesis that synchronous body movement is the basis for more explicit social interaction by measuring the amount of fingertip movement between two participants who were instructed to extend their arms and point their index fingers toward one anothermuch like the famous scene in E.T. between the alien and Elliott. They were explicitly instructed to keep their own fingers as stationary as possible while keeping their eyes open. The researchers simultaneously recorded the neuronal activity
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Contact: Caltech Media Relations
mr@caltech.edu
626-395-3226
California Institute of Technology
Source:Eurekalert

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