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The Journal of Neurophysiology Vol. 85 No. 3 March 2001, pp. 1328-1331
Copyright ©2001 by the American Physiological Society
RAPID COMMUNICATION
Institut National de la Santé et de la Recherche Médicale U371, 69500 Bron, France
Girard, P.,
J. M. Hupé, and
J. Bullier.
Feedforward and Feedback Connections Between Areas V1 and V2 of
the Monkey Have Similar Rapid Conduction Velocities. J. Neurophysiol. 85: 1328-1331, 2001. It is often
assumed that the action of cortical feedback connections is slow and
modulatory, whereas feedforward connections carry a rapid drive to
their target neurons. Recent results from our laboratory showed a very
rapid effect of feedback connections on the visual responses of neurons
in lower order areas. We wanted to determine whether such a rapid
action is mediated by fast conducting axons. Using electrical
stimulation, we compared the conduction velocities along feedforward
and feedback axons between areas V1 and V2 of the macaque monkey. We
conclude that feedback and feedforward connections between V1 and V2
have comparable fast conduction velocities (around 3.5 m/s).
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