Changes in horizontal oculomotor behaviour coincide with a shift in visual motion perception.
During full-field rotation of the visual field, subjects commonly experience an initial perception of object-motion which 'switches' to a perception of self-motion. We studied the characteristics of the horizontal optokinetic nystagmus responses evoked by a moving visual stimulus in these two perceptual states over a range of stimulus velocities. During self-motion perception mean eye position was found to shift more in the direction of the newly appearing stimulus elements with a slight reduction in slow phase gain in comparison to the nystagmus evoked during object-motion perception. The results may reflect a modified strategy of spatial attention with increased emphasis on anticipatory eye movements during visually induced self-motion perception.
Thilo
K V
KV
MRC Human Movement and Balance Unit, National Hospital for Neurology and Neurosurgery, London, UK.
Guerraz
M
M
Bronstein
A M
AM
Gresty
M A
MA
D000328:Adult; D005133:Eye Movements / Q000502:physiology; D005260:Female; D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D017120:Nystagmus, Optokinetic / Q000502:physiology; D009801:Oculomotor Muscles / Q000502:physiology*; D013997:Time Factors