Temporal properties of inputs to direction-selective neurons in monkey V1.
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 4Calpha 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.
Saul
Alan B
AB
Department of Neurobiology, University of Pittsburgh School of Medicine, Pennsylvania, USA. asaul@mcg.edu
Carras
Peter L
PL
Humphrey
Allen L
AL
D000200:Action Potentials / Q000502:physiology; D000818:Animals; D008254:Macaca nemestrina; D009039:Motion Perception / Q000502:physiology*; D009474:Neurons / Q000145:classification / Q000502:physiology*; D009949:Orientation / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time / Q000502:physiology; D013028:Space Perception / Q000502:physiology*; D013997:Time Factors; D014793:Visual Cortex / Q000166:cytology* / Q000502:physiology; D014794:Visual Fields / Q000502:physiology; D014795:Visual Pathways / Q000502:physiology*