title: Decreases in the critical disparity gradient with eccentricity may reflect the size-disparity correlation.
abstract: The interaction between dot separation and fusible disparity limits (critical disparity gradient) was assessed at 0, 2, 4, and 8 deg eccentricity by 19 subjects. The critical disparity gradient showed a significant decrease with eccentricity such that larger separations were required for fusion of a given disparity as eccentricity increased. An argument is put forth that this relationship supports a size-disparity correlation. The significant disparity-eccentricity interaction may be explained by both the progressive loss of higher-spatial-frequency channels with eccentricity and a reduction in the range of disparities processed by a channel as eccentricity is increased. Individual differences in the trend across eccentricity are noted and discussed.
authors.affiliation: Stephen F. Austin State University, Nacogdoches, Texas 75962-3046, USA.
authors.forename: L F
authors.initials: LF
authors.lastname: Scharff
mesh_terms: D003867:Depth Perception / Q000502:physiology; D006801:Humans; D008954:Models, Biological; D013028:Space Perception / Q000502:physiology; D015357:Vision Disparity; D015348:Vision, Binocular / Q000502:physiology