Probing visual motion signals with a priming paradigm
Probing visual motion signals with a priming paradigm
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DOI：
10.1016/s0042-6989(96)00162-9
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发表时间：
1997-03-01
期刊：
影响因子：
1.8
通讯作者：
Pantle, A
中科院分区：
文献类型：
--
作者：
Pinkus, A;Pantle, A
经历突然 180 度相移（运动步长）的垂直正弦波亮度光栅的感知运动是不明确的，光栅有时看起来向右移动；有时向左。然而，当180度步长紧随明确光栅步长时，180度步长看起来与明确步长处于相同方向，这种现象被称为视觉运动启动（VMP），并且在一系列实验中研究了该现象的一些特征，主要发现是启动（1）持续了数百毫秒； (2)当启动步骤的幅度为90°时达到最大值； (3)在0.7-2.8 c/deg范围内几乎不受空间频率的影响； （4）超阈值对比度取决于构成启动步骤的帧的相对对比度，而不是绝对对比度。实验是在运动能量模型（Adelson＆Bergen，1985）的框架内进行的，该模型拥有一个额外的阶段，可以随时间求和运动信号，一些结果可以通过第二阶段积分器来解释，VMP和对比度之间的其他非线性关系需要某种形式的运动信号压缩，甚至可能需要动态对比度处理机制。 (C) 1997 爱思唯尔科学有限公司。
The perceived motion of a vertical sine-wave luminance grating which undergoes an abrupt 180 deg phase shift (motion step) is ambiguous, The grating sometimes appears to move rightward; sometimes leftward. However, when the 180 deg step follows closely upon an unambiguous grating step, the 180 deg step appears to be in the same direction as the unambiguous step, This phenomenon is termed visual motion priming (VMP), and some of the characteristics of the phenomenon were investigated in a series of experiments, The main findings were that priming (1) lasted for hundreds of msec; (2) was at a maximum when the magnitude of the priming step was 90 deg; (3) was scarcely affected by spatial frequency in the range 0.7-2.8 c/deg; and (4) at suprathreshold contrasts depended upon the relative contrast, not the absolute contrasts, of the frames comprising the priming step, The experiments were conducted within the framework of a motion energy model (Adelson & Bergen, 1985) which possessed an extra stage which summed motion signals over time, Some of the results could be explained by the second-stage integrator, Other nonlinear relationships between VMP and contrast require some form of motion signal compression, and perhaps even a mechanism of dynamic contrast processing. (C) 1997 Elsevier Science Ltd.