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J Neurophysiol (May 31, 2006). doi:10.1152/jn.00106.2006
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Submitted on January 31, 2006
Accepted on May 25, 2006

Early visuomotor representations revealed from evoked local field potentials in motor and premotor cortical areas

John G O'Leary1 and Nicholas G Hatsopoulos1*

1 Organismal Biology & Anatomy, University of Chicago, Chicago, Illinois, United States

* To whom correspondence should be addressed. E-mail: nicho{at}uchicago.edu.

Local field potentials (LFPs) recorded from primary motor cortex (MI) have been shown to be tuned to the direction of visually guided reaching movements, but MI LFPs have not been shown to be tuned to the direction of an upcoming movement during the delay period that precedes movement in an instructed-delay reaching task. Also, LFPs in dorsal premotor cortex (PMd) have not been investigated in this context. We therefore recorded LFPs from MI and PMd of monkeys (Macaca Mulatta) and investigated whether these LFPs were tuned to the direction of the upcoming movement during the delay period. We identified LFP activity in three frequency bands that was phase-locked to the onset of the instruction stimulus that specified the direction of the upcoming reach. The amplitude of this activity was often tuned to target direction with tuning widths that varied across different electrodes and frequency bands. Single trial decoding of LFPs demonstrated that prediction of target direction from this activity was possible well before the actual movement is initiated. Decoding performance was significantly better in the slowest frequency band as compared to the other two higher frequency bands. Although these results demonstrate that task-related information is available in the local field potentials, correlations among these signals recorded from a densely packed array of electrodes suggests that adequate decoding performance for neural prosthesis applications may be limited as the number of simultaneous electrode recordings is increased.




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I. Asher, E. Stark, M. Abeles, and Y. Prut
Comparison of Direction and Object Selectivity of Local Field Potentials and Single Units in Macaque Posterior Parietal Cortex During Prehension
J Neurophysiol, May 1, 2007; 97(5): 3684 - 3695.
[Abstract] [Full Text] [PDF]




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