File:ERP Stereoscopic.pdf

When geometric or contoured shapes are generated as disparity regions in dynamic random-dot stereograms, the question of whether the subject’s response is evoked largely by boundaries and corners of the disparate region arises. To examine this question a disparate square was shifted randomly within a focal region at one millisecond intervals, resultmg in a nebulous stimulus which “welled up” in the centre of the field of view. The technique may be regarded as an analogue of the defocusing technique used to resolve similar questions about evoked potentials to patterned stimuli. Average visual evoked potentials (VEP) were recorded from homolateral p