title: Difficulties in the definition of 'stereoscotoma' using temporal detection of thresholds of dynamic random dot stereograms.
abstract: Temporal detection thresholds are reported from two subjects to dynamic random dot stereograms (DRDSs) of both crossed and uncrossed disparity. The stimuli were 1 degree square, of 0.25 degrees disparity and were presented at 81 positions in a 9 degree square central region. In both subjects crossed disparity stimuli were detected at shorter durations. One subject displayed particularly acute stereoscopic vision and presented a pattern of temporal thresholds increasing gradually with eccentricity. The other subject displayed evidence, particularly in response to uncrossed stimuli, of a 'stereo-scotoma' which was not evident in monocular testing or ophthalmologic examination. Criteria used to define 'stereo-scotoma' are discussed. It was concluded that, although left-right field differences may be found with a large subject sample, individual factors may be more important in the distribution of stereo sensitivity throughout the portion of visual field tested.
authors.affiliation: University of Newcastle, N.S.W., Australia.
authors.forename: D C
authors.initials: DC
authors.lastname: Finlay
authors.forename: M L
authors.initials: ML
authors.lastname: Manning
authors.forename: D P
authors.initials: DP
authors.lastname: Dunlop
authors.forename: S A
authors.initials: SA
authors.lastname: Dewis
mesh_terms: D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D010775:Photic Stimulation; D011897:Random Allocation; D012607:Scotoma / Q000503:physiopathology*; D012684:Sensory Thresholds; D013997:Time Factors; D014794:Visual Fields