How does saccade adaptation affect visual perception?
How does saccade adaptation affect visual perception?
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DOI：
10.1167/8.8.3
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发表时间：
2008-01-01
影响因子：
1.8
通讯作者：
Schor, Clifton M.
中科院分区：
文献类型：
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作者：
Hernandez, Teresa D.;Levitan, Carmel A.;Schor, Clifton M.
视觉定位目标和刺激眼跳的信号有三种：(1)眼跳预期幅度的视网膜定位信号，(2)视网膜信号到眼外肌神经的感觉-运动转换（SMT），以及(3)从视网膜外信号估计眼睛位置。研究了视跳幅度对目标位置双步变化的适应对感知方向的影响。在指向灰烬的任务中，受试者将一只看不见的手指向一个短暂出现的古怪目标，而不做扫视。在持续指向任务中，受试者水平扫视到一个双步目标。在第二步之后的一秒钟，他们用一只看不见的手指向最后的目标位置。在眼珠缩短适应后，手指向眼睛的方位角变化不大。这表明大部分的跳跃性适应是由SMT的变化引起的。在眼球延长适应后，手指向的方位角有微小的变化。这表明1/3的扫视适应是由估计的视网膜定位信号的变化引起的，2/3是由SMT的变化引起的。持续的手指向任务表明，眼睛位置的估计与SMT的变化呈负相关。眼跳适应引起的方向感知变化主要受视网膜外因素的影响，视网膜外因素在延长条件下占很小的比例。
Three signals are used to visually localize targets and stimulate saccades: (1) retinal location signals for intended saccade amplitude, (2) sensory-motor transform (SMT) of retinal signals to extra-ocular muscle innervation, and (3) estimates of eye position from extra-retinal signals. We investigated effects of adapting saccade amplitude to a double-step change in target location on perceived direction. In a. ashed-pointing task, subjects pointed an unseen hand at a briefly displayed eccentric target without making a saccade. In a sustained-pointing task, subjects made a horizontal saccade to a double-step target. One second after the second step, they pointed an unseen hand at the final target position. After saccade-shortening adaptation, there was little change in hand-pointing azimuth toward the. ashed target suggesting that most saccade adaptation was caused by changes in the SMT. After saccade-lengthening adaptation, there were small changes in hand-pointing azimuth to. ashed targets, indicating that 1/3 of saccade adaptation was caused by changes in estimated retinal location signals and 2/3 by changes in the SMT. The sustained hand-pointing task indicated that estimates of eye position adapted inversely with changes of the SMT. Changes in perceived direction resulting from saccade adaptation are mainly influenced by extra-retinal factors with a small retinal component in the lengthening condition.