J. Cogn. Neurosci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Moody, S. L.
Right arrow Articles by Zipser, D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Moody, S. L.
Right arrow Articles by Zipser, D.

The Journal of Cognitive Neuroscience, Vol 10, 35-45, Copyright © 1998 by The MIT Press

ARTICLES

A Model of Reaching Dynamics in Primary Motor Cortex

Sophie Lee Moody and David Zipser

Features of virtually all voluntary movements are represented in the primary motor cortex. The movements can be ongoing, imminent, delayed, or imagined. Our goal was to investigate the dynamics of movement representation in the motor cortex. To do this we trained a fully recurrent neural network to continually output the direction and magnitude of movements required to reach randomly changing targets. Model neurons developed preferred directions and other properties similar to real motor cortical neurons. The key finding is that when the target for a reaching movement changes location, the ensemble representation of the movement changes nearly monotonically, and the individual neurons comprising the representation exhibit strong, nonmonotonic transients. These transients serve as internal recurrent signals that force the ensemble representation to change more rapidly than if it were limited by the time constants of individual neurons. These transients, if they exist, could be observed in experiments that require only slight modifications of the standard paradigm used to investigate movement representation in the motor cortex.


This article has been cited by other articles:


Home page
 J. Neurophysiol.Home page
V. Raos, M.-A. Umilta, A. Murata, L. Fogassi, and V. Gallese
Functional Properties of Grasping-Related Neurons in the Ventral Premotor Area F5 of the Macaque Monkey
J Neurophysiol, February 1, 2006; 95(2): 709 - 729.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurosci.Home page
K. Zhang and T. J. Sejnowski
A Theory of Geometric Constraints on Neural Activity for Natural Three-Dimensional Movement
J. Neurosci., April 15, 1999; 19(8): 3122 - 3145.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurosci.Home page
S. L. Moody, S. P. Wise, G. di Pellegrino, and D. Zipser
A Model That Accounts for Activity in Primate Frontal Cortex during a Delayed Matching-to-Sample Task
J. Neurosci., January 1, 1998; 18(1): 399 - 410.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
NEURAL COMPUTATION J COGNITIVE NEUROSCIENCE MIT PRESS JOURNALS
Copyright © 1998 by The MIT Press.