Processing time of contour integration: the role of colour, contrast, and curvature
Processing time of contour integration: the role of colour, contrast, and curvature
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DOI：
10.1068/p3164
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发表时间：
2001-01-01
期刊：
影响因子：
1.7
通讯作者：
Mullen, KT
中科院分区：
文献类型：
--
作者：
Beaudot, WHA;Mullen, KT
我们研究了轮廓积分任务中红绿、蓝黄和亮度机制的时间特性，该任务需要跨空间的方向链接来检测“路径”。无论路径是否存在，都获得了简单检测刺激的反应时间，以及通过随机呈现路径和无路径刺激的是/否程序测量的路径检测的反应时间。轮廓积分的额外处理时间被计算为简单刺激检测和路径检测的反应时间之间的差异，并且被测量为直线和弯曲路径的刺激对比度的函数。我们发现处理时间的影响在选择反应时间测量中并不明显。 (i) 弯曲路径的处理时间比直线路径长。 (ii) 对于直线路径，消色差机构比两个彩色机构更快，红绿和蓝黄机构之间没有差异。对于弯曲路径，不同机制的处理时间没有差异。 (iii) 与直线路径相比，对于消色差机制，检测弯曲路径所需的额外处理时间最长，对于红-绿和蓝-黄机制也类似，(iv) 检测是否存在路径需要至少 50 ms 的额外时间，与色度、对比度和路径曲率无关。讨论了感受器后机制之间这些差异和相似性的重要性。
We investigated the temporal properties of the red-green, blue-yellow, and luminance mechanisms in a contour-integration task which required the linking of orientation across space to detect a 'path'. Reaction times were obtained for simple detection of the stimulus regardless of the presence of a path, and for path detection measured by a yes/no procedure with path and no-path stimuli randomly presented. Additional processing times for contour integration were calculated as the difference between reaction times for simple stimulus detection and path detection, and were measured as a function of stimulus contrast for straight and curved paths. We found that processing time shows effects not apparent in choice reaction-time measurements. (i) Processing time for curved paths is longer than for straight paths. (ii) For straight paths, the achromatic mechanism is faster than the two chromatic ones, with no difference between the red-green and blue-yellow mechanisms. For curved paths there is no difference in processing time between mechanisms. (iii) The extra processing time required to detect curved compared to straight paths is longest for the achromatic mechanism, and similar for the red-green and blue-yellow mechanisms, (iv) Detection of the absence of a path requires at least 50 ms of additional time independently of chromaticity, contrast, and path curvature. The significance of these differences and similarities between postreceptoral mechanisms is discussed.