Anisotropies in visual motion perception: a fresh look
Anisotropies in visual motion perception: a fresh look
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DOI：
10.1364/josaa.15.002003
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发表时间：
1998-08-01
影响因子：
1.9
通讯作者：
Hiris, E
中科院分区：
文献类型：
--
作者：
Gros, BL;Blake, R;Hiris, E
我们测量了运动检测和运动判别性能的不同方向的运动，使用随机运动序列。随机点电影包含200个点在一个圆形的光圈被用作刺激在两个间隔的强迫选择程序。在运动检测实验中，观察者判断两个间隔中哪一个包含弱相干运动，另一个间隔只包含随机运动。在方向辨别实验中，观察者看到一个标准的运动方向，然后是一个稍微不同方向的比较运动。观察员指出相对于标准品，比较是顺时针还是逆时针。在检测任务中测试了12个运动方向，在辨别任务中测试了5个标准方向（3个基本方向和2个倾斜方向）。检测阈值是不变的运动方向，但方向辨别阈值显着较高的倾斜方向的运动，即使在低相干水平。来自控制条件的结果排除了监视器伪影，并且表明倾斜效应是相对于视网膜坐标的。这些结果对运动感知的计算和生理模型具有广泛的影响。(C)1998年美国光学学会。
We measured motion-detection and motion-discrimination performance for different directions of motion, using stochastic motion sequences. Random-dot cinematograms containing 200 dots in a circular aperture were used as stimuli in a two-interval forced-choice procedure. In the motion-detection experiment, observers judged which of two intervals contained weak coherent motion, the other interval containing random motion only. In the direction-discrimination experiment, observers viewed a standard direction of motion followed by comparison motion in a slightly different direction. Observers indicated whether the comparison was clockwise or counterclockwise, relative to the standard. Twelve directions of motion were tested in the detection task and five standard directions (three cardinal directions and two oblique directions) in the discrimination task. Detection thresholds were invariant with direction of motion, but direction-discrimination thresholds were significantly higher for motion in oblique directions, even at low-coherence levels. Results from control conditions ruled out monitor artifacts and indicate that the oblique effect is relative to retinal coordinates. These results have broad implications for computational and physiological models of motion perception. (C) 1998 Optical Society of America.