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J Neurophysiol 89: 1136-1142, 2003; doi:10.1152/jn.00364.2002
0022-3077/03 $5.00
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J Neurophysiol (February 1, 2003). 10.1152/jn.00364.2002
Submitted on Submitted 14 May 2002; accepted in final form 4 October 2002

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Dynamical Organization of Directional Tuning in the Primate Premotor and Primary Motor Cortex

Yoram Ben-Shaul,* Eran Stark,* Itay Asher, Rotem Drori, Zoltan Nadasdy, and Moshe Abeles

Department of Physiology, Hadassah Medical School and the Interdisciplinary Center for Neural Computation, The Hebrew University, Jerusalem, Israel 91120

Ben-Shaul, Yoram, Eran Stark, Itay Asher, Rotem Drori, Zoltan Nadasdy, and Moshe Abeles. Dynamical Organization of Directional Tuning in the Primate Premotor and Primary Motor Cortex. J. Neurophysiol. 89: 1136-1142, 2003. Although previous studies have shown that activity of neurons in the motor cortex is related to various movement parameters, including the direction of movement, the spatial pattern by which these parameters are represented is still unresolved. The current work was designed to study the pattern of representation of the preferred direction (PD) of hand movement over the cortical surface. By studying pairwise PD differences, and by applying a novel implementation of the circular variance during preparation and movement periods in the context of a center-out task, we demonstrate a nonrandom distribution of PDs over the premotor and motor cortical surface of two monkeys. Our analysis shows that, whereas PDs of units recorded by nonadjacent electrodes are not more similar than expected by chance, PDs of units recorded by adjacent electrodes are. PDs of units recorded by a single electrode display the greatest similarity. Comparison of PD distributions during preparation and movement reveals that PDs of nearby units tend to be more similar during the preparation period. However, even for pairs of units recorded by a single electrode, the mean PD difference is typically large (45° and 75° during preparation and movement, respectively), so that a strictly modular representation of hand movement direction over the cortical surface is not supported by our data.

* Y. Ben-Shaul and E. Stark contributed equally to this work.




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