Schor C M, Wood I
Vision Res. 1983;23(12):1649-54. doi: 10.1016/0042-6989(83)90179-7.
The disparity range for stereo sensitivity was investigated with spatially filtered bars, tuned narrowly over a broad range of spatial frequencies. When measured with narrow (high spatial frequency) bars the disparity range for stereopsis exceeded two orders of magnitude. The range was reduced with broad (low spatial frequency) bars by an elevation of stereothreshold that increased according to a constant 6 deg phase disparity. The upper disparity limit also increased at broad spatial periods but at a lower rate. These size disparity correlations illustrate quantitative stereopsis along a continuum from fine to coarse disparities (+/- 2 deg). A disparity matching task revealed that greater amounts of uncrossed than crossed disparity were required to match suprathreshold disparities. The ratio of standard/matched disparity was lower in both directions for small suprathreshold disparities subtended by broad than by narrow spatial periods. This selective reduction of stereo-efficiency ratio illustrates tuning to coarse disparities subtended by broad (low spatial frequency) stimuli and accounts for the marked reduction of stereoacuity caused by spectacle blur.
使用在很宽空间频率范围内进行窄调谐的空间滤波条来研究立体视觉敏感度的视差范围。当用窄（高空间频率）条进行测量时，立体视觉的视差范围超过两个数量级。随着条变宽（低空间频率），视差范围会因立体视觉阈值的升高而减小，该阈值升高是根据恒定的6度相位视差而增加的。在宽空间周期下，上视差极限也会增加，但速率较低。这些大小视差相关性说明了从精细到粗略视差（±2度）连续范围内的定量立体视觉。一项视差匹配任务显示，匹配超阈值视差时，所需的非交叉视差量比交叉视差量更多。对于由宽空间周期而非窄空间周期所对的小超阈值视差，标准/匹配视差的比率在两个方向上都更低。这种立体视觉效率比的选择性降低说明了对宽（低空间频率）刺激所对的粗略视差的调谐，并解释了由眼镜模糊导致的立体视锐度的显著降低。
