Magnitudes of disparity vergence responses at different convergence levels

An experiment was conducted with three subjects to examine the relation between the initial convergence level and disparity vergence. Magnitudes of vergence movements were measured by the photo-electric method when target stimuli with 2° or 4° retinal disparity were presented for various exposure durations (100-900 ms) to the eyes directed to an initial fixation stimulus located in the mid-sagittal plane with convergence angles of 3.1°, 6.2°, or 12.4°. The obtained results showed that as the initial convergence angle decreases, the magnitude of vergence response decreases in the divergent direction, but not in the convergent direction; this asymmetrical effect is clear only in longer exposure durations, that is, in those of at least 300 ms or more. The theoretical implications of these results are discussed in the context of the underlying processes of disparity vergence movements

Audiology · Cognitive psychology · Context (archaeology) · Convergence (economics) · Fixation (population genetics) · Geodesy · Optics · Physics · Sagittal plane · Stimulus (psychology) · Vergence (optics) · Anatomy · EEG and Brain-Computer Interfaces · Geology · Mathematics · Medicine · Psychology · Tactile and Sensory Interactions · Visual perception and processing mechanisms