Local and global factors in disparity detection of rows of points

The threshold for the detection of disparity between points 10, 20 and 60 min apart was shown to depend on the number of intervening points. Even a single point bisecting the imaginary line both in depth and in visual angle often causes an approximate doubling of threshold and performance continues to deteriorate up to a point spacing that makes the line appear continuous. The effect is less pronounced if the intervening points are removed from the imaginary line joining the endpoints. Disparity detection in this kind of task involves local depth comparison of adjoining points and a more global mechanism.

[1]  G. Westheimer Spatial interaction in the domain of disparity signals in human stereoscopic vision. , 1986, The Journal of physiology.

[2]  D H Mershon,et al.  Local autonomy in visual space. , 1977, Scandinavian journal of psychology.

[3]  S P McKee,et al.  Stereogram design for testing local stereopsis. , 1980, Investigative ophthalmology & visual science.

[4]  G. Westheimer,et al.  The perception of depth in simple figures , 1984, Vision Research.

[5]  Distance discrimination; effect on threshold of lateral separation of the test objects. , 1948, Archives of ophthalmology.

[6]  Suzanne P. McKee,et al.  The spatial requirements for fine stereoacuity , 1983, Vision Research.

[7]  B. Julesz,et al.  A disparity gradient limit for binocular fusion. , 1980, Science.