Masking Effects in Cyclopean Surface Perception
Masking Effects in Cyclopean Surface Perception
复制标题
独眼表面感知中的掩蔽效应
DOI：
10.1167/16.12.835
复制
发表时间：
2016
影响因子：
1.8
通讯作者：
Goutcher R
中科院分区：
文献类型：
--
作者：
Goutcher R
视差定义的循环形式的感知既需要视差的成功测量，也需要跨图像的多个视差测量的链接。因此，旋转式任务的性能限制可能取决于在视差测量阶段和在确定表面结构的后期阶段出现的困难。为了评估这些因素在环行任务中的作用，参与者被呈现了深度视差定义的随机点正弦波纹，并被要求执行一项方位辨别任务。波纹被嵌入到随机点掩模中，其结构要么是随机视差分布，要么是反相位视差正弦。使用多种掩模类型来评估随机和结构化视差信号在干扰圆环性能方面的贡献。获得了将方向辨别性能降低到75%正确水平所需的掩蔽点数量的阈值。对于随机的视差分布，掩模与表面网点的比率随着表面网点数量的增加而增加，范围从60点波纹的0.91到200点波纹的3.5。对于具有120点目标波纹的反相掩模，阈值在掩模与表面网点比为0.5左右，下降到概率性能的比率为1。这些结果表明，反相掩模结构比随机视差分布更能有效地破坏环路性能。当掩模和表面点的数量相等时，随着波纹的视差幅度的增加、环状频率的降低或刺激点数的增加，在环状方位辨别任务中的绩效提高到阈值以上。使用视差测量的局部互相关模型，我们表明，心理物理表现不能完全由目标视差的互相关测量的减少来解释，而必须由涉及多个视差测量关联的过程中产生的模糊性所导致。
The perception of disparity-defined cyclopean form requires both the successful measurement of disparity and the linkage of multiple disparity measurements across the image. Performance limitations in cyclopean tasks may therefore depend on both difficulties arising at the disparity measurement stage and at later stages, where surface structure is determined. To assess the contribution of these factors in cyclopean tasks, participants were presented with disparity-defined random-dot sinusoidal corrugations in depth and asked to perform an orientation discrimination task. Corrugations were presented embedded in random-dot masks, which were structured as either random disparity distributions, or anti-phase disparity sinusoids. Multiple mask types were used in order to assess the contributions of both random and structured disparity signals in disrupting cyclopean performance. Thresholds were obtained for the number of masking dots required to reduce orientation discrimination performance to 75% correct levels. For random disparity distributions, mask-to-surface-dot ratios increased with increasing numbers of surface dots, ranging from 0.91 for 60-dot corrugations to 3.5 for 200-dot corrugations. For anti-phase masks with a 120-dot target corrugation, thresholds were around a mask-to-surface-dot ratio of 0.5, falling to chance performance by a ratio of 1. These results show that anti-phase mask structures are more effective at disrupting cyclopean performance than random disparity distributions. At a ratio of 1, where the numbers of mask and surface dots are equal, performance in the cyclopean orientation discrimination task improved, to above threshold performance, with increasing disparity amplitude of the corrugation, decreasing cyclopean frequency, or an increase in the total number of stimulus dots. Using a local cross-correlation model of disparity measurement, we show that psychophysical performance cannot be fully accounted for by a decrease in cross-correlation measures at target disparities, but must instead result from ambiguities arising in processes involved with the linkage of multiple disparity measurements.