Integrating local motion signals detected by the primary motion detector is crucial for representing a rigid, two-dimensional motion. The nature of motion integration has been studied using stimuli consisting of two superimposed sinusoidal gratings of different orientations, called plaid motion, and it has been shown that humans perceive integrated motion in the direction where the component constraint lines are intersected. We previously found that pigeons and humans perceive different movement directions from plaid motion; pigeons responded to the vector average direction of the gratings. Although this suggests that the underlying processes of motion integration differ between the two species, the viewing distance in the pigeon experiment, which used a touch panel procedure, was much smaller than in typical human experiments. The current study investigated the potential effect of viewing distance on the perception of plaid motion in pigeons. We trained six pigeons to detect whether motion directions were tilted leftward or rightward while a visual display was presented 0 or 40 cm from an operant chamber. The pigeons responded to plaid stimuli for both viewing distance conditions as if they perceived motion in the vector average direction of two-component gratings. The result indicates that the species difference in plaid perception is not an artefact of viewing distance and suggests that pigeons use a different strategy than humans for integrating visual motion.

中文翻译：

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鸽子（Columba livia）使用矢量平均法则整合视觉运动：观察距离的影响。

积分由主要运动检测器检测到的局部运动信号对于表示刚性二维运动至关重要。通过使用由两个不同方向的叠加正弦光栅组成的刺激（称为格子运动）来研究运动集成的本质，并且已经表明，人类在部件约束线相交的方向上感知到了集成运动。我们以前发现鸽子和人类从格子运动中会感觉到不同的运动方向。鸽子响应光栅的矢量平均方向。尽管这表明两种物种之间运动整合的基本过程有所不同，但是使用触摸面板程序进行的鸽子实验的观察距离比典型的人类实验小得多。当前的研究调查了观看距离对鸽子格子运动感知的潜在影响。我们训练了六只鸽子，以检测运动方向是向左倾斜还是向右倾斜，同时在距操作室0或40 cm处显示视觉显示。鸽子在观察距离条件时都对格子刺激做出反应，就好像他们感觉到了两组分光栅在矢量平均方向上的运动一样。结果表明，格子感知中的物种差异不是观察距离的假象，这表明鸽子采用与人类不同的策略来整合视觉运动。我们训练了六只鸽子，以检测运动方向是向左倾斜还是向右倾斜，同时在距操作室0或40 cm处显示视觉显示。鸽子在观察距离条件时都对格子刺激做出反应，就好像他们感觉到了两组分光栅在矢量平均方向上的运动一样。结果表明，格子感知中的物种差异不是观察距离的假象，这表明鸽子采用与人类不同的策略来整合视觉运动。我们训练了六只鸽子，以检测运动方向是向左倾斜还是向右倾斜，同时在距操作室0或40 cm处显示视觉显示。鸽子在观察距离条件时都对格子刺激做出反应，就好像他们感觉到了两组分光栅在矢量平均方向上的运动一样。结果表明，格子感知中的物种差异不是观察距离的假象，这表明鸽子采用与人类不同的策略来整合视觉运动。