正常人における SACCADIC ADAPTATION [in Japanese] Saccadic Adaptation in Normal Subjects [in Japanese]
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We studied properties of adaptive gain control in the saccadic system in 7 normal subjects. Subjects were asked to look at a target which moved in steps of random amplitude of 20 or 30 deg. In the present study, the target eccentricity was changed by a constant percentage (60%) during each saccade aimed at the target. At the beginning, a primary saccade was induced toward the first target position, and a second saccade triggered by a second target step subsequently occurred in the direction of the second target. After repeated trials of the stimulus, the amplitude of primary saccade gradually decreased and finally the eyes caught the second target with a single saccade. The amplitude of the primary saccade was measured and the percentage of saccadic amplitude (accuracy) was defined relative to the amplitude of the first target step. The accuracy was gradually decreased during the course of the experiment and in the course of hundred repetitions, the accuracy approached 60%. Subjects did not detect intrasaccadic target displacements because visual sense was suppressed during saccadic eye movements. Therefore, the reduction of saccadic amplitude was not the result of a conscious strategy, but adaptive gain control that must originate in the saccadic system.
- Equilibrium Research
Equilibrium Research 54(5), 425-430, 1995-10-01
Japan Society for Equilibrium Research