Motion Extrapolation in the Central Fovea
Motion Extrapolation in the Central Fovea
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DOI：
10.1371/journal.pone.0033651
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发表时间：
2012-03-15
期刊：
影响因子：
3.7
通讯作者：
Nijhawan, Romi
中科院分区：
文献类型：
--
作者：
Shi, Zhuanghua;Nijhawan, Romi
当物体在视野中移动时，如果延迟没有得到补偿，神经传递延迟会引入空间滞后。提出了一种视觉预测机制，通过外推运动物体的位置来克服这种空间滞后。然而，如果物体突然停止移动（运动终止），则通常没有向前移动的位置。最近的一项“外推修正”假说表明，前向移位的缺失是由代表“失败”预测的感官信号引起的。到目前为止，这个假设只在中央凹外的视网膜位置进行了测试。我们用两个中央凹暗点来检验这一假设：暗点和蓝光暗点。我们发现，在运动终止过程中，模糊点的感知位置被外推到中央凹。接下来，我们比较了蓝色和绿色移动点的感知位置移动。正如预测的那样，在运动终止处的外推只发现了蓝色的运动点。研究结果为空间敏感度最高的中央凹区域的外推修正假说提供了新的证据。
Neural transmission latency would introduce a spatial lag when an object moves across the visual field, if the latency was not compensated. A visual predictive mechanism has been proposed, which overcomes such spatial lag by extrapolating the position of the moving object forward. However, a forward position shift is often absent if the object abruptly stops moving (motion-termination). A recent "correction-for-extrapolation'' hypothesis suggests that the absence of forward shifts is caused by sensory signals representing 'failed' predictions. Thus far, this hypothesis has been tested only for extra-foveal retinal locations. We tested this hypothesis using two foveal scotomas: scotoma to dim light and scotoma to blue light. We found that the perceived position of a dim dot is extrapolated into the fovea during motion-termination. Next, we compared the perceived position shifts of a blue versus a green moving dot. As predicted the extrapolation at motion-termination was only found with the blue moving dot. The results provide new evidence for the correction-for-extrapolation hypothesis for the region with highest spatial acuity, the fovea.