Integration of motion energy from overlapping random background noise increases perceived speed of coherently moving stimuli.
Integration of motion energy from overlapping random background noise increases perceived speed of coherently moving stimuli.
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来自重叠随机背景噪声的运动能量的积分增加了连贯移动刺激的感知速度。
DOI：
10.1152/jn.01068.2015
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发表时间：
2016
影响因子：
2.5
通讯作者：
Huang,Xin
中科院分区：
文献类型：
--
作者：
Chuang,Jason;Ausloos,EmilyC;Schwebach,CourtneyA;Huang,Xin
视觉运动的感知会受到视觉环境的深刻影响。为了深入了解视觉系统如何表示运动速度，我们研究了不沿净方向移动的背景刺激如何影响中心刺激的感知速度。视觉刺激是两个重叠的随机点图案。中心刺激沿固定方向连贯移动，而背景刺激随机移动。我们发现，当背景包含运动噪声时，人类受试者感知到的中心刺激的速度明显快于其真实速度。有趣的是，感知速度是根据背景的噪音水平进行调整的。当中心刺激的速度较低时，当背景运动噪声水平较低时达到最高感知速度。随着中心速度的增加，在逐渐升高的背景噪声水平下达到峰值感知速度。速度高估的效果需要中心刺激与背景重叠。在一定范围内增加背景尺寸增强了效果，表明空间整合。当中心刺激和背景刺激具有不同的颜色，或者当它们被放置在不同的深度时，速度高估显着减少或消除。当中心刺激和背景刺激在感知上可分离时，速度高估与中心刺激和背景刺激之间的感知相似性相关。这些结果表明，随机运动噪声的运动能量积分对速度感知具有显着影响。我们的研究结果对有关速度感知的神经基础的模型提出了新的限制。
The perception of visual motion can be profoundly influenced by visual context. To gain insight into how the visual system represents motion speed, we investigated how a background stimulus that did not move in a net direction influenced the perceived speed of a center stimulus. Visual stimuli were two overlapping random-dot patterns. The center stimulus moved coherently in a fixed direction, whereas the background stimulus moved randomly. We found that human subjects perceived the speed of the center stimulus to be significantly faster than its veridical speed when the background contained motion noise. Interestingly, the perceived speed was tuned to the noise level of the background. When the speed of the center stimulus was low, the highest perceived speed was reached when the background had a low level of motion noise. As the center speed increased, the peak perceived speed was reached at a progressively higher background noise level. The effect of speed overestimation required the center stimulus to overlap with the background. Increasing the background size within a certain range enhanced the effect, suggesting spatial integration. The speed overestimation was significantly reduced or abolished when the center stimulus and the background stimulus had different colors, or when they were placed at different depths. When the center- and background-stimuli were perceptually separable, speed overestimation was correlated with perceptual similarity between the center- and background-stimuli. These results suggest that integration of motion energy from random motion noise has a significant impact on speed perception. Our findings put new constraints on models regarding the neural basis of speed perception.