Variation of stereothreshold with random-dot stereogram density.

ABSTRACT:

Purpose

Reports of dissimilar stereothresholds for contour and random-dot (RD) targets may reflect differences in stimulus properties or differences between local and global stereoscopic processing mechanisms. In this study, we evaluated whether the stereothresholds obtained using low- and high-density RD stimuli are consistent with a distinction between local and global disparity processing.

Methods

Stereothresholds were measured in eight normal subjects for a small disparate line segment superimposed on RD surrounds with densities that ranged between 0.07 and 28.3%.

Results

Stereothresholds averaged 0.23 arc min for an RD density of 0.39% and approximately doubled for lower and higher densities. The increase in stereothresholds at low densities is likely because of

SUBMITTER: Gantz L 

PROVIDER: S-EPMC3163004 | biostudies-literature | 2011 Sep

REPOSITORIES: biostudies-literature