Spatiotemporal properties of motion perception for random-check contrast modulations
Spatiotemporal properties of motion perception for random-check contrast modulations
复制标题
随机检查对比度调制运动感知的时空特性
DOI：
10.1016/0042-6989(93)90184-x
复制
发表时间：
1993
期刊：
影响因子：
1.8
通讯作者：
S. Nishida
中科院分区：
文献类型：
--
作者：
S. Nishida
为了阐明检测对比度调制运动的机制，研究了对比度运动方向辨别的时空特性。刺激是微平衡随机刺激[Chubb和Sperling（1988）Journal of the Optical Society of America A 5，1986-2007]，称为随机窗口运动图（RWK），一种移位的随机棋盘图案，其中每个检查是一片随机点（帧之间不相关）或一片具有随机点平均亮度的均匀灰色。当第一帧和第二帧的曝光持续时间相同时，曝光持续时间（艾德）对RWK辨别的影响表现为SOA依赖性，但当第一帧艾德较短而第二帧较长时，RWK辨别的效果优于SOA预测的结果。与具有相似刺激参数（例如检查大小、有效对比度）的随机点运动图（RDK）相比，RWK可以在更长的刺激间间隔处看到。对于RWK，可以看到不相干的运动（例如，反向phi）。RWK的最大位移极限（Dmax）与RDK相当，但它随检查尺寸成比例增加，而RDK的Dmax则不随检查尺寸成比例增加。这些结果表明，对比度运动机制提取运动局部，并涉及相关型运动提取阶段类似的亮度运动机制。此外，对比度运动检测器的空间范围与亮度运动检测器的空间范围相当，但是它们的时间范围更大。对比度运动机制比亮度运动机制更具有尺度不变性。
To clarify the mechanism of detecting the motion of contrast modulations, the spatiotemporal properties of direction discrimination for contrast motion were examined. The stimulus was a microbalanced random stimulus [Chubb and Sperling (1988)Journal of the Optical Society of America A 5, 1986–2007], termed random-window kinematogram (RWK), a shifting random checkerboard pattern in which each check was either a patch of random dots (uncorrelated between frames) or a patch of uniform gray having the mean luminance of the random dots. The effect of exposure duration (ED) on RWK discrimination could be described as stimulus onset asynchrony (SOA) dependency when EDs of the first and second frames were the same, but the performance was better than predicted from SOA when the first ED was short while the second was long. RWK could be seen at longer inter-stimulus intervals than random-dot kinematogram (RDK) having similar stimulus parameters (e.g. check size, effective contrast). Incoherent motion (e.g. reversed phi) could be seen for RWK. Maximum displacement limit (Dmax) for RWK was comparable to that of RDK, but it increased in proportion to check size, whileDmaxfor RDK did not. These results suggest that the contrast motion mechanism extracts motion locally, and involves a correlation-type motion extraction stage similar to the luminance motion mechanism. In addition, the spatial ranges of the contrast motion detectors are comparable to those of the luminance motion detectors, but their temporal range is larger. The contrast motion mechanism is more scale-invariant than the luminance motion mechanism.