Abstract
To understand the extent of individual differences in stereopsis and the mechanisms responsible, we conducted three experiments on human depth perception from binocular disparity. In the first experiment stereo acuity was measured in 118 healthy young adults. Half had good stereo thresholds of less than 20 seconds, while in 13% sensitivity was too low to determine thresholds. The second experiment measured weights of binocular disparity and pictorial perspective depth information in multiple depth-cue integration. The weights of perspective were distributed over a wide range, from 0 to 1.5. Correlation between weights of perspective and stereo thresholds was low. The third experiment examined influences of stimulus motion on depth perception from large binocular disparity. The results can be explained to some extent by the basic stereo ability determined in the former two experiments ; however, it appears that in order to describe human stereo ability comprehensively, other factors should be known, such as stereo sensitivity in the peripheral visual field and/or sensitivity to slant.
