Centripetal bias on preparation for smooth pursuit eye movements based on the anticipation.
It has been reported that a brief perturbation of a stationary target during fixation induces larger eye movement when monkeys anticipate future smooth pursuit than when they do not. Here, we recorded eye movements in human subjects after briefly perturbing a target and the eccentricity of its initial position was changed under three conditions: (1) subjects anticipated saccades for a target that appeared before; (2) they anticipated smooth pursuit for a target that appeared before; and (3) they anticipated smooth pursuit but did not know beforehand where the target started from. We found that in condition 2 substantial eye movements were induced by the perturbation started moving toward the center. However, weak responses were observed in conditions 1 and 3. These results indicate that ocular responses to brief perturbations of the target at eccentric positions are increased with centripetal bias when human subjects prepare for future smooth pursuit.
Tabata
H
H
Neuroscience Research Institute, National Institute of Advanced Industrial Science and Technology, 305-8568, Ibaraki, Japan. htabata@brain.med.kyoto-u.ac.jp
Hashimoto
K
K
Inaba
N
N
Kawano
K
K
D000328:Adult; D001921:Brain / Q000502:physiology; D003071:Cognition / Q000502:physiology; D005260:Female; D005403:Fixation, Ocular / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009039:Motion Perception / Q000502:physiology*; D015588:Observer Variation; D010775:Photic Stimulation; D011698:Pursuit, Smooth / Q000502:physiology*; D012438:Saccades / Q000502:physiology; D014794:Visual Fields / Q000502:physiology