Central and peripheral interactions in the perception of optic flow
Central and peripheral interactions in the perception of optic flow
复制标题
DOI：
10.1016/s0042-6989(02)00355-3
复制
发表时间：
2002-11-01
期刊：
影响因子：
1.8
通讯作者：
Faubert, JN
中科院分区：
文献类型：
--
作者：
Habak, C;Casanova, C;Faubert, JN
这项工作的目的是评估中央和外周刺激对大空间范围内光流感知的影响。测量了模拟观察者平移和径向运动的rdk的相干阈值。实验I和3a测量了一个圆形中心区域、几个离心率增加的环形区域和一个全场刺激（直径80度）对速度范围的灵敏度。结果表明，信号被整合的空间范围可能会有所不同，以最大化可用于感知表征的信息。实验2和实验3b通过比较不同信号强度和方向对其中一个区域的影响，评估了中央和外周在方向识别任务中的相互作用。在中心或外围存在噪声点（0%相干性）导致性能从基线测量下降。当两个区域中的点向相反方向移动时，也观察到类似的下降。当两个区域的点向同一方向移动时，较强的外围信号会促进方向识别，而较强的中心信号则不会。这些发现表明，在光流的整合中，中枢和外围输入是不可分离的，它们在正常条件下对感知的贡献是相同的（信号强度相等），而外围刺激在生态相关条件下（如能见度低）似乎很重要。(C) 2002 Elsevier Science Ltd.版权所有。
The purpose of this work was to evaluate the effects of central and peripheral stimulation on the perception of optic flow over large spatial extents. Coherence thresholds were measured for RDKs simulating observer translation and radial motion. Experiments I and 3a measured sensitivity to a range of speeds for a circular central region, for several annular regions of increasing eccentricity, and for a full-field stimulus (80degrees diameter). Results suggest that the spatial extent over which signals are integrated may vary in order to maximize the information available for perceptual representations. Experiments 2 and 3b evaluated central and peripheral interactions in a direction discrimination task, by comparing the effects of different signal strengths and directions in one of the two regions. The presence of noise dots (0% coherence) in either center or periphery led to a performance decrease from baseline measures. A similar decrease was observed when dots in the two regions moved in opposite directions. When dots in both regions moved in the same direction, a stronger peripheral signal led to facilitation of direction discrimination, whereas a stronger central signal did not. These findings suggest that central and peripheral inputs are not separable in the integration of optic flow, that they contribute equally to the percept under normal conditions (equal signal strength), and that peripheral stimulation seems important under ecologically relevant conditions such as poor visibility. (C) 2002 Elsevier Science Ltd. All rights reserved.