Independent systems of orientation columns in upper and lower layers of monkey visual cortex.
Using a multi-microelectrode, in 5 animals, orientation tuning was measured simultaneously in 30 closely spaced parallel penetrations perpendicular to the surface of the striate cortex. Actual penetration angles were determined by three-dimensional track reconstruction. Above and below layer IVc, two columnar systems were found whose orientation angles were independent.
D000818:Animals; D001931:Brain Mapping; D002522:Chlorocebus aethiops; D005074:Evoked Potentials, Visual; D009039:Motion Perception / Q000502:physiology; D009474:Neurons / Q000502:physiology; D009949:Orientation / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D014793:Visual Cortex / Q000502:physiology*; D014795:Visual Pathways / Q000502:physiology