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J Neurophysiol (January 18, 2006). doi:10.1152/jn.01011.2005
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Submitted on September 27, 2005
Accepted on January 11, 2006

Neuronal activity related to elapsed time in prefrontal cortex

Aldo Genovesio1, Satoshi Tsujimoto1, and Steven P. Wise1*

1 NIMH, Bethesda, MD, USA

* To whom correspondence should be addressed. E-mail: stevenwise{at}mail.nih.gov.

We studied prefrontal cortex activity during a saccade task. On each trial, one of three delay periods elapsed between the onset of a visual stimulus and its offset, which triggered a saccade. After stimulus offset, many neurons showed phasic increases in activity that depended on the duration of the preceding delay period. This delay-dependent activity varied only weakly with reaction time and instead appeared to reflect a more-general aspect of elapsed time.




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