Grating and plaid chrominance motion influences the suppressed ocular following response.
Involuntary eye movements to foveal stimulation were measured in a monkey while it performed a fixation task. Second-order plaid motion generated higher velocities of eye movements than did first-order gratings, yet the latency of the early following response was no different for grating or plaid motion. Nevertheless, early suppressed ocular following responses to isoluminant motion continue to be titrated by stimulus velocity and spatial frequency. Motion defined by 60% luminance contrast gratings and plaids generated a motion signal gain of 60% over chrominance motion. The 20% longer latency of eye movements to chrominance motion may reflect the longer conduction latency of the parvocellular channel and an additional stage in cortical processing en route to motion areas and eye movement control.
Guo
K
K
University Laboratory of Physiology, Oxford, UK.
Benson
P J
PJ
D000704:Analysis of Variance; D000818:Animals; D003116:Color; D005133:Eye Movements / Q000502:physiology*; D008027:Light; D008253:Macaca mulatta; D009038:Motion; D009039:Motion Perception / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods; D011698:Pursuit, Smooth / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D013997:Time Factors