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J Neurophysiol (March 2, 2005). doi:10.1152/jn.00868.2004
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Submitted on August 23, 2004
Accepted on March 1, 2005

Temporal properties of inputs to direction selective neurons in monkey V1

Alan B. Saul*, Peter L. Carras, and Allen L. Humphrey

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

Motion in the visual scene is processed by direction selective neurons in primary visual cortex. These cells receive inputs that differ in space and time. What are these inputs? A previous single unit recording study in anesthetized monkey V1 (DeValois et al., 2000) proposed that the two major streams arising in the primate retina, the M and P pathways, differed in space and time as required to create direction selectivity. We confirmed that cortical cells driven by P inputs tend to have sustained responses. The M pathway, however, as assessed by recordings in layer 4C{alpha} and from cells with high contrast sensitivity, is not purely transient. The diversity of timing in the M stream suggests that combinations of M inputs, as well as of M and P inputs, create direction selectivity.




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