When circles become triangular: how transsaccadic predictions shape the perception of shape
When circles become triangular: how transsaccadic predictions shape the perception of shape
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DOI：
10.1111/nyas.12672
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发表时间：
2015-01-01
期刊：
影响因子：
--
通讯作者：
Schneider, Werner X.
中科院分区：
文献类型：
--
作者：
Herwig, Arvid;Weiss, Katharina;Schneider, Werner X.
人类视觉的特点是眼球跳跃式运动的一致模式。随着每次扫视，内部物体表征改变其视网膜位置和空间分辨率。这就提出了一个问题，即迫在眉睫的眼球跳跃性运动是如何影响周围知觉的。在这里，我们认为扫视伴随着对其感知结果的预测（即目标物体的注视点）。因此，外周感知应该偏向于先前相关的中央凹输入。在这项研究中，我们首先让参与者接触到一个改变的视觉刺激，其中一个物体在扫视期间系统地改变了它的形状。随后，参与者必须判断短暂呈现的周边扫视目标的形状。结果显示，对于之前从外围更圆变为中央凹更三角形的物体，目标被认为不那么弯曲。类似地，以前从三角形变成圆形的物体的形状被认为更弯曲。因此，外周感知似乎不仅依赖于当前输入，还依赖于记忆经验，从而能够预测跳眼运动的感知结果。
Human vision is characterized by a consistent pattern of saccadic eye movements. With each saccade, internal object representations change their retinal position and spatial resolution. This raises the question as to how peripheral perception is affected by imminent saccadic eye movements. Here, we suggest that saccades are accompanied by a prediction of their perceptual consequences (i.e., the foveation of the target object). Accordingly, peripheral perception should be biased toward previously associated foveal input. In this study, we first exposed participants to an altered visual stimulation where one object systematically changed its shape during saccades. Subsequently, participants had to judge the shape of briefly presented peripheral saccade targets. The results showed that targets were perceived as less curved for objects that previously changed from more circular in the periphery to more triangular in the fovea. Similarly, shapes were perceived as more curved for objects that previously changed from triangular to circular. Thus, peripheral perception seems to depend not solely on the current input but also on memorized experiences, enabling predictions about the perceptual consequences of saccadic eye movements.