Kaiser Marcus, Lappe Markus
Department of Zoology and Neurobiology, Ruhr-University Bochum, Germany.
Neuron. 2004 Jan 22;41(2):293-300. doi: 10.1016/s0896-6273(03)00849-3.
Saccadic eye movements transiently distort perceptual space. Visual objects flashed shortly before or during a saccade are mislocalized along the saccade direction, resembling a compression of space around the saccade target. These mislocalizations reflect transient errors of processes that construct spatial stability across eye movements. They may arise from errors of reference signals associated with saccade direction and amplitude or from visual or visuomotor remapping processes focused on the saccade target's position. The second case would predict apparent position shifts toward the target also in directions orthogonal to the saccade. We report that such orthogonal mislocalization indeed occurs. Surprisingly, however, the orthogonal mislocalization is restricted to only part of the visual field. This part comprises distant positions in saccade direction but does not depend on the target's position. Our findings can be explained by a combination of directional and positional reference signals that varies in time course across the visual field.
扫视眼动会短暂地扭曲感知空间。在扫视之前或扫视过程中不久闪现的视觉对象会沿扫视方向被错误定位，类似于扫视目标周围空间的压缩。这些错误定位反映了在眼动过程中构建空间稳定性的过程中的短暂误差。它们可能源于与扫视方向和幅度相关的参考信号的误差，或者源于聚焦于扫视目标位置的视觉或视觉运动重映射过程。第二种情况将预测在与扫视正交的方向上也会出现朝向目标的明显位置偏移。我们报告称这种正交错误定位确实会发生。然而，令人惊讶的是，正交错误定位仅局限于视野的一部分。这部分包括扫视方向上的远处位置，但不取决于目标的位置。我们的发现可以通过在整个视野中随时间变化的方向和位置参考信号的组合来解释。
