Gheorghiu Elena, Erkelens Casper J
Helmholtz Institute, Utrecht University, The Netherlands.
Perception. 2005;34(10):1205-19. doi: 10.1068/p5404.
In studies of the temporal flexibility of the stereoscopic system, it has been suggested that two different processes of binocular depth perception could be responsible for the flexibility: tolerance for interocular delays and temporal integration of correlation. None has investigated the relationship between tolerance for delays and temporal integration mechanisms and none has revealed which mechanism is responsible for depth perception in dynamic random-dot stereograms. We address these questions in the present study. Across five experiments, we investigated the temporal properties of stereopsis by varying interocular correlation as a function of time in controlled ways. We presented different types of dynamic random-dot stereograms, each consisting of two pairs of alternating random-dot patterns. Our experimental results demonstrate that (i) disparities from simultaneous monocular inputs dominate those from interocular delayed inputs; (ii) stereopsis is limited by temporal properties of monocular luminance mechanisms; and (iii) depth perception in dynamic random-dot stereograms results from cross-correlation-like operation on two simultaneous monocular inputs that represent the retinal images after having been subjected to a process of monocular temporal integration of luminance.
在对立体视觉系统时间灵活性的研究中，有人提出双眼深度感知的两种不同过程可能导致了这种灵活性：对双眼延迟的耐受性和相关性的时间整合。尚未有人研究延迟耐受性与时间整合机制之间的关系，也没有人揭示在动态随机点立体图中哪种机制负责深度感知。我们在本研究中解决这些问题。在五个实验中，我们通过以可控方式改变双眼相关性作为时间的函数，研究了立体视觉的时间特性。我们呈现了不同类型的动态随机点立体图，每个立体图由两对交替的随机点图案组成。我们的实验结果表明：(i) 来自同时单眼输入的视差主导来自双眼延迟输入的视差；(ii) 立体视觉受单眼亮度机制的时间特性限制；(iii) 动态随机点立体图中的深度感知是由对两个同时单眼输入进行类似互相关的操作产生的，这两个单眼输入代表了经过单眼亮度时间整合过程后的视网膜图像。
