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New Brain Neuromarker May Shed Light on Autism and Schizophrenia

Researchers have been able to identify neural signatures of effective, real-time coordination between people to actually record, measure and analyze both behavior and brain activity simultaneously in two interacting humans.

Researchers used a specially designed dual-electroencephalogram (EEG) and the conceptual framework and methods of coordination dynamics in this study, The Phi Complex as a Neuromarker of Human Social Coordination, published in the May 8, 2007 Proceedings of the National Academy of Sciences. The research was conducted by Drs. Emmanuelle Tognoli, Julien Lagarde, Gonzalo DeGuzman and J.A. Scott Kelso in The Human Brain and Behavior Laboratory at the Center for Complex Systems and Brain Sciences in the Charles E. Schmidt College of Science at FAU.

Using EEG recordings, Tognoli and colleagues collected the brain activity of two people simultaneously performing continuous finger motion. At first, the two subjects were asked to wag their fingers but were not allowed to see each others hands. Then, like the shutter release of a camera, the barrier placed between them was removed so they could see each other as they continued to wag their fingers. When subjects were allowed to see each others fingers moving, sometimes they adjusted their own movements and synchronized with each other, and sometimes they did not, behaving independently.

While many interactions between people rely on mutual information exchange, little is known about how such social processes are integrated in the brain, said Kelso, the Glenwood and Martha Creech Eminent Scholar in Science and founder of the Center for Complex Systems and Brain Sciences. What this research suggests is that a unique pattern can be seen in the brains of two people interacting and that these brain activities distinguish independence from cooperation. This new brain rhythm that we have discovered and termed the phi complex actually distinguishes when youre socially in
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