Orientation shift between upper and lower layers in monkey visual cortex.
Microelectrode penetrations nearly normal to the layers of foveal striate cortex in awake, behaving monkeys reveal a shift in orientation preference between cells in the upper and lower layers. Mean shift size for 57 penetrations is 54.8 degrees, with 70% of the penetrations showing shifts of 45-90 degrees. Marking lesions localize the shift to the border between layers 4C and 5. The data are suggestive of inhibition between the upper and lower layers within an "orientation column".
D000818:Animals; D000882:Haplorhini; D009474:Neurons / Q000502:physiology; D014793:Visual Cortex / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D014796:Visual Perception; D005680:gamma-Aminobutyric Acid / Q000494:pharmacology
D005680:gamma-Aminobutyric Acid