Orientation dependent modulation of apparent speed:: psychophysical evidence
Orientation dependent modulation of apparent speed:: psychophysical evidence
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DOI：
10.1016/s0042-6989(02)00303-6
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发表时间：
2002-11-01
期刊：
影响因子：
1.8
通讯作者：
Lorenceau, J
中科院分区：
文献类型：
--
作者：
Georges, S;Seriès, P;Lorenceau, J
我们报告了几个实验表明，在表观运动序列中移动的Gabor贴片，当其方向与运动路径对齐时，比当其方向与运动路径成一定角度时，其速度要快得多。这种效应非常大，在高速（64度/s）时达到峰值，在较高和较低的速度下减小，在低速（40度/s）时消失。该速度偏差随着运动轴和Gabor贴片的取向之间的角度的增加而减小，但是对于曲线路径保持高，只要元件取向保持与运动轨迹相切。它不被依赖于运动序列的总长度和持续时间或连续帧之间的差距大小（或空间跳跃）的决策策略所考虑。我们提出了一个简单的解释，作为一个计算模型，在配套文件彻底发展（系列，Georges，Lorenceau和Fragnac：“视速度的取向相关调制：a model based on the dynamics of forfeedback and horizontal connectivity in VI cortex”，Vision Research，42，2757），根据该方法，VI中的长距离水平连接响应于视在运动序列而引起差分等待时间调制，视在运动序列在NIT级处的读出导致感知速度偏差。这些研究结果的后果进行了讨论。(C)2002爱思唯尔科技有限公司版权所有。
We report several experiments showing that a Gabor patch moving in apparent motion sequences appears much faster when its orientation is aligned with the motion path than when it is at an angle to it. This effect is very large and peaks at high speeds (64degrees/s), decreases for higher and lower speeds and disappears at low speeds (4degrees/s). This speed bias decreases as the angle between the motion axis and the orientation of the Gabor patch increases, but remains high for curvilinear paths, provided that element orientation is kept tangential to the motion trajectory. It is not accounted for by decision strategies relying on the overall length and duration of the motion sequence or the gap size (or spatial jump) between successive frames. We propose a simple explanation, thoroughly developed as a computational model in a companion paper (Series, Georges, Lorenceau, & Fragnac: "Orientation dependent modulation of apparent speed: a model based on the dynamics of feedforward and horizontal connectivity in V I cortex", Vision Research, 42, 2757), according to which long-range horizontal connections in VI elicit differential latency modulations in response to apparent motion sequences, whose read-out at an NIT stage results in a perceptual speed bias. The consequences of these findings are discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.