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Temporal Properties of Inputs to Direction-Selective Neurons in Monkey V1

Department of Neurobiology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania

Submitted 23 August 2004; accepted in final form 1 March 2005

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 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 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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