Perisaccadic perception of continuous flickers
Perisaccadic perception of continuous flickers
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DOI：
10.1016/j.visres.2004.09.010
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发表时间：
2005-02-01
期刊：
影响因子：
1.8
通讯作者：
Nishida, S
中科院分区：
文献类型：
--
作者：
Watanabe, J;Noritake, A;Nishida, S
为了实现感知空间恒定性，视觉系统补偿由眼球运动引起的视网膜位移。据报道，补偿过程在扫视期间不能完美地发挥作用，即扫视期间的闪光会系统性地错误定位。然而，对瞬态闪光刺激进行的观察并不一定表明空间恒常性的普遍的周期性故障。为了研究视觉系统如何实现连续刺激的视跳空间恒定性，我们检查了视跳 500 Hz 闪烁的定位时间过程，以及起始时间、偏移时间和持续时间的系统变化。如果闪烁中的每个闪光以与单个闪光相同的方式单独定位，则应根据跳频闪光的错误定位的时间过程来预测闪烁的表观位置和长度。然而，结果在很多方面并不支持这一预测。当在扫视期间出现闪烁时，感知到点阵列（视网膜图像长度的一半），而当仅在扫视之前或之后出现闪烁时，仅感知到单个点。取决于闪烁的开始定时、偏移定时和持续时间，闪烁中的闪烁被定位在不同的位置，即使闪烁是在与扫视相同的定时出现的。一般来说，我们的结果支持两阶段定位，其中首先主要基于视网膜信息生成局部几何配置，然后作为整体定位在自我中心或外中心空间中。定位基于在时间上远离扫视的时间采样的眼睛位置信号，这使得连续刺激能够实现精确定位和空间恒定性。 (C) 2004 Elsevier Ltd. 保留所有权利。
To realize perceptual space constancy, the visual system compensates for the retinal displacement caused by eye movements. it has been reported that the compensation process does not function perfectly around the time of a saccade-a perisaccadic flash is systematically mislocalized. However, observations made with transient flash stimuli do not necessarily indicate a general perisaccadic failure of space constancy. To investigate how the visual system realizes perisaccadic space constancy for continuous stimuli, we examined the time course of localization for a perisaccadic 500 Hz flicker with systematic variation of the onset timing, the offset timing and the duration. If each flash in the flicker is localized individually in the same way as a single flash, the apparent position and length of the flicker should be predicted from the time course of mislocalization of a perisaccadic flash. However, the results did not support this prediction in many respects. A dot array (of half the length of the retinal image) was perceived when the flicker was presented during a saccade, while only a single dot was perceived when the flicker was presented only before or after the saccade. A flash in a flicker was localized at a different position, depending on the onset timing, the offset timing and the duration of the flicker, even if the flash was presented at the same timing to the saccade. In general, our results support a two-stage localization ill which the local geometrical configuration is first generated primarily based oil the retinal information, and then localized as a whole in the egocentric or exocentric space. The localization is based on the eye position signal sampled at a time temporally distant from the saccade, which enables precise localization and space constancy for continuous stimuli. (C) 2004 Elsevier Ltd. All rights reserved.