Responsiveness of Clare-Bishop neurons to visual cues associated with motion of a visual stimulus in three-dimensional space.
Photic responsiveness of cells in the medial bank of the lateral suprasylvian cortex (Clare-Bishop area) was studied using a three-dimensional visual stimulator that reproduced two visual cues (motion disparity and change in size) for perception of three-dimensional motion of a visual stimulus. About one third of them (48/148) were selectively responsive to motion disparity corresponding to approaching (AP cells, n = 30) or recessive motion (RC cells, N = 18), another half to motion of retinal images in the same direction between the two eyes corresponding to fronto-parallel motion (FP cells, n = 75), and the remaining cells were rather equally responsive to these types of stimuli (NS cells, n = 25). More than a half of the AP (19/30) or RC (11/18) cells were also responsive to increase or decrease in stimulus size, respectively, and they were optimally activated by a combination of the motion and size stimuli while relatively few FP and NS cells were sensitive to change in stimulus size. These findings indicate that the Clare-Bishop cells encode three-dimensional motion on the basis of photic responsiveness to the motion and size cues.
D000818:Animals; D002415:Cats; D003867:Depth Perception / Q000502:physiology; D005074:Evoked Potentials, Visual; D009039:Motion Perception / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D012858:Size Perception / Q000502:physiology; D014793:Visual Cortex / Q000166:cytology / Q000502:physiology*