Observers were trained to point with feedback to red and blue dots whose images had been laterally displaced in opposite directions by a reversible prism. On pretraining and posttraining trials the red and blue dots were aligned vertically in the absence of visual orientation cues. The alignment was modified by the pointing training on the posttraining trials. The colors were aligned in the direction of their prior prismatic displacement. One control experiment showed that the alignment aftereffect requires feedback during the pointing task. Another experiment in which observers pointed to the red and blue dots with opposite arms showed that pointing to both dots with the same arm was necessary to produce the alignment aftereffect. Changes in the perceived position of objects in the visual field occur when changes in perceived limb position cannot compensate for a sensorimotor conflict. Eye torsion or fixation displacements are proposed as alternative mechanisms mediating the aftereffect.

译文

观察者经过训练,可以通过反馈指向红色和蓝色的点,这些点的图像已被可逆棱镜沿相反方向横向移位。在训练前和训练后试验中,在没有视觉方向提示的情况下,红色和蓝色点垂直对齐。通过训练后试验的定点训练修改了对齐方式。颜色在其先前的棱柱形位移方向上对齐。一个控制实验表明,对准后效应需要在指向任务期间进行反馈。观察者指向具有相反臂的红色和蓝色点的另一个实验表明,指向具有相同臂的两个点对于产生对齐后效是必要的。当感知到的肢体位置的变化不能补偿感觉运动冲突时,就会发生物体在视野中感知位置的变化。提出了眼扭转或固定位移作为介导后效的替代机制。

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