Stereoacuity thresholds in the presence of a reference surface
Stereoacuity thresholds in the presence of a reference surface
复制标题
DOI：
10.1016/s0042-6989(01)00192-4
复制
发表时间：
2001-10-01
期刊：
影响因子：
1.8
通讯作者：
Parker, AJ
中科院分区：
文献类型：
--
作者：
Andrews, TJ;Glennerster, A;Parker, AJ
对于孤立的双目目标，在固定平面中发现最佳深度辨别（Blakemore. C.. Journal of Physiology 211（1970）599）。最近的研究表明，立体阈值并不总是绝对视差的简单函数。而是取决于刺激的相对差异。在这里，我们更详细地探讨了相对差距的影响。特别注意控制受试者可能改变其双眼位置或利用由附加参考线索提供的单眼信息的可能性。受试者判断由随机定位的点组成的正面平行参考面内空白窗口中比较线上方的垂直目标线的深度。在单个试验中，参考表面呈现为三个视差之一（-10.0和+10弧分）。控制双眼位置的变化。曝光持续时间为150 ms，并且随机交错具有参考表面和比较线的不同差异的实验条件。为了控制单眼线索，相对于在所有方面与参考平面条件相同的视差噪声条件来确定阈值的变化。除了点的视差被随机分配在10和+10弧分之间。当表面与比较线处于相同深度时，立体声阈值降低约2倍。当比较视差接近与参考表面相同的深度时，阈值也会降低，但当比较视差具有相反的视差符号时，阈值通常会升高。这些结果提供了明确的证据表明，视差检测系统的基本灵敏度可以受到与任务无关的相对视差线索的影响。(C)2001爱思唯尔科技有限公司版权所有。
With isolated binocular targets, the best depth discrimination is found in the fixation plane (Blakemore. C.. Journal of Physiology 211 (1970) 599). More recent studies have suggested that stereoscopic thresholds are not always a simple function of absolute disparity. but depend on the relative disparities in the stimulus. Here, we explored the effects of relative disparity in more detail. taking particular care to control for the possibility that subjects might change their binocular eye position or exploit monocular information provided by additional reference cues. Subjects judged the depth of a vertical target line presented above a comparison line in a blank window within a fronto-parallel reference surface composed of randomly positioned dots. On individual trials, the reference surface was presented at one of three disparities (-10.0 and +10 arc min). To control for changes in binocular eye position. exposure duration was 150 ms, and experimental conditions with different disparities of the reference surface and comparison line were randomly interleaved. To control for monocular cues, changes in threshold were determined with respect to a disparity noise condition that was in all ways identical to the reference plane condition. except that the disparities of the dots were randomly assigned between 10 and +10 arc min. Stereo-thresholds were lowered by a factor of about 2 when the surface was at the same depth as the comparison line. Thresholds were also lowered when the comparison disparity was close to the same depth as the reference surface, but were often raised when the comparison disparity had the opposite disparity sign. These results provide unequivocal evidence that the fundamental sensitivity of the disparity detecting system can be influenced by relative disparity cues that are not related to the task. (C) 2001 Elsevier Science Ltd. All rights reserved.