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首页> 外文期刊>Journal of vision >Psychophysical differences in processing of global motion and form detection and position discrimination
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Psychophysical differences in processing of global motion and form detection and position discrimination

机译：全局运动处理和形式检测以及位置辨别中的心理物理差异

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In models of complex motion processing of expanding, contracting or rotating patterns, localization of the center of motion is regarded as an implicit function of the system, used for heading determination and achieved by coarse population encoding. The situation modeled contains an optic flow pattern that is modified by including translational motion, as occurs when the observer is not looking directly at their heading, and relies on global processing of the entire optic flow field. Our psychophysics experiments show that accurately localizing the center of a symmetrical complex motion pattern, or an analogous complex radial or concentric form pattern, relies on local processing near the center of the pattern. This contrasts with detection of the same patterns, which involves considerable spatial summation, relies on global processing, and is very tolerant of noisy stimuli. Coarse localization uses both central and peripheral information, involving some spatial summation. Some differences are seen between different pattern types. The low level of spatial summation seen in position discrimination is surprising if position discrimination is seen as an implicit function of the global processing system, and suggests modifications may be needed to models of heading determination.
机译：在扩展，收缩或旋转模式的复杂运动处理模型中，运动中心的定位被视为系统的隐式功能，用于航向确定并通过粗略总体编码实现。建模的情况包含一个光流模式，该光流模式通过包含平移运动而进行了修改，这发生在观察者未直接注视其航向时，并且依赖于整个光流场的全局处理。我们的心理物理学实验表明，精确定位对称复杂运动模式（或类似的复杂径向或同心形式模式）的中心依赖于模式中心附近的局部处理。这与检测相同模式相反，后者涉及大量的空间求和，依赖于全局处理，并且对噪声刺激非常宽容。粗略的定位同时使用中心信息和外围信息，涉及一些空间求和。在不同的模式类型之间可以看到一些差异。如果将位置识别视为全局处理系统的隐式功能，则在位置识别中看到的低水平的空间求和是令人惊讶的，并且表明可能需要对航向确定模型进行修改。

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