Sridhar Deepika, Bedell Harold E
College of Optometry, University of Houston, 505 J Armistead Bldg, Houston, TX 77204-2020, USA.
Vision Res. 2011 May 11;51(9):1075-85. doi: 10.1016/j.visres.2011.02.023. Epub 2011 Mar 1.
Perceived egocentric direction (EVD) is based on the sensed position of the eyes in the orbit and the oculocentric visual direction (eye-centered, OVD). Previous reports indicate that in some subjects eye-position information from the two eyes contributes unequally to the perceived EVD. Findings from other studies indicate that the retinal information from the two eyes may not always contribute equally to perceived OVD. The goal of this study was to assess whether these two sources of information covary similarly within the same individuals. Open-loop pointing responses to an isolated target presented randomly at several horizontal locations were collected from 13 subjects during different magnitudes of asymmetric vergence to estimate the contribution of the position information from each eye to perceived EVD. For the same subjects, the direction at which a horizontally or vertically disparate target with different interocular contrast or luminance ratios appeared aligned with a non-disparate target estimated the relative contribution of each eye's retinal information. The results show that the eye-position and retinal information vary similarly in most subjects, which is consistent with a modified version of Hering's law of visual direction.
感知到的自我中心方向（EVD）基于眼睛在眼眶中的感知位置和以眼为中心的视觉方向（以眼睛为中心，OVD）。先前的报告表明，在一些受试者中，来自双眼的眼位信息对感知到的EVD的贡献并不相等。其他研究的结果表明，来自双眼的视网膜信息对感知到的OVD的贡献可能并不总是相等。本研究的目的是评估这两种信息来源在同一受试者中是否具有相似的共变关系。在不同程度的不对称性聚散过程中，从13名受试者收集对随机出现在几个水平位置的孤立目标的开环指向反应，以估计每只眼睛的位置信息对感知到的EVD的贡献。对于相同的受试者，具有不同双眼间对比度或亮度比的水平或垂直视差目标与非视差目标看起来对齐的方向估计了每只眼睛视网膜信息的相对贡献。结果表明，在大多数受试者中，眼位和视网膜信息具有相似的变化，这与视觉方向的赫林定律的修正版本一致。
