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J Neurophysiol (June 27, 2007). doi:10.1152/jn.00238.2007
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Submitted on March 5, 2007
Accepted on June 27, 2007

Brain areas selective for both observed and executed movements

Ilan Dinstein1*, Uri Hasson1, Nava Rubin1, and David J Heeger2

1 CNS, NYU, New York, New York, United States
2 Psychology, NYU, New York, New York, United States; CNS, NYU, New York, New York, United States

* To whom correspondence should be addressed. E-mail: ilan{at}cns.nyu.edu.

When observing a particular movement a subset of movement-selective visual and visuomotor neurons are active in the brain of the observer forming a representation of the observed movement. Similarly, when executing a movement a subset of movement-selective motor and visuomotor neurons are active forming a representation of the executed movement. In this study we used an fMRI-adaptation protocol to assess cortical response selectivity to observed and executed movements simultaneously. Subjects freely played the rock-paper-scissors game against a videotaped opponent, sometimes repeatedly observing or executing the same movement on subsequent trials. Numerous brain areas exhibited adaptation (repetition suppression) during either repeated observations or repeated executions of the same movement. A subset of areas exhibited an overlap of both effects, containing neurons with selective responses for both executed and observed movements. We describe the function of these unique movement representation areas in the context of the human mirror system, which is expected to respond selectively to both observed and executed movements.




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