Visual versus motor vector inversions in the antisaccade task:: a behavioral investigation with saccadic adaptation
Visual versus motor vector inversions in the antisaccade task:: a behavioral investigation with saccadic adaptation
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DOI：
10.1152/jn.01082.2007
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发表时间：
2008-05-01
影响因子：
2.5
通讯作者：
Dore-Mazars, Karine
中科院分区：
文献类型：
--
作者：
Collins, Therese;Vergilino-Perez, Dorine;Dore-Mazars, Karine
在反眼跳任务中，受试者必须执行远离视觉目标的眼球运动。正确执行反眼跳需要抑制朝向视觉目标的前眼跳并编程向相反侧的运动。这种运动可以基于视觉矢量的反转，对应于注视点和视觉目标之间的距离，或不需要的前行运动的运动矢量。我们通过扫视适应来分离这两个向量。当系统瞄准误差是由扫视期间视觉目标的位移引起时，可以观察到适应。适应逐渐修改扫视幅度（由运动矢量定义），使其适合扫视后刺激位置，从而不同于目标的视觉矢量。如果反扫视准备依赖于视觉矢量反转，则向右扫视适应不应转移到向左反扫视（基于相同的视觉矢量），而应转移到向右反扫视（基于适应场内的视觉矢量）。如果反扫视准备依赖于运动矢量反转，则向右扫视适应应转移到向左反扫视（基于相同的适应运动矢量），但不应转移到向右反扫视（基于非适应运动矢量）。结果与第一个假设一致，表明矢量反转先于扫视适应，并表明抗扫视准备取决于视觉目标矢量的反转。
In the antisaccade task, subjects must execute an eye movement away from a visual target. Correctly executing an antisaccade requires inhibiting a prosaccade toward the visual target and programming a movement to the opposite side. This movement could be based on the inversion of the visual vector, corresponding to the distance between the fixation point and the visual target, or the motor vector of the unwanted prosaccade. We dissociated the two vectors by means of saccadic adaptation. Adaptation can be observed when systematic targeting errors are caused by the displacement of the visual target during the saccade. Adaptation progressively modifies saccade amplitude (defined by the motor vector) such that it becomes appropriate to the postsaccadic stimulus position and thus different from the visual vector of the target. If antisaccade preparation depended on visual vector inversion, rightward prosaccade adaptation should not transfer to leftward antisaccades (which are based on the same visual vector) but should transfer to rightward antisaccades (which are based on a visual vector inside the adaptation field). If antisaccade preparation depended on motor vector inversion, rightward prosaccade adaptation should transfer to leftward antisaccades (which are based on the same, adapted motor vector) but should not transfer to rightward antisaccades (which are based on a nonadapted motor vector). The results are in line with the first hypothesis, showing that vector inversion precedes saccadic adaptation and suggesting that antisaccade preparation depends on the inversion of the visual target vector.