The relationship between the required time for the stereopsis and the pixel density of random dot pattern

In order to analyze the performance of 3D perception using controlled random dot patterns containing different pixel density, a minimum required time of depth perception was estimated. The experimental task was to discriminate displayed figures which had three different apparent depths in the random-dot-stereogram on a computer controlled CRT screen. Results showed that the required time for depth perception in the experimental condition was not longer than that in the control condition. This suggests that the depth information processing in the human brain is not only a correlation computation of images from both eyes but also another processing stage based upon multiple feedback mechanism from various visual areas.