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Abstract:
Disparity-evoked vergence is studied in stereograms showing one or
two depth planes which are defined by isolated dots of varying density
and contrast. Vergence position immediately after stimulus
presentation was measured using a psychophysical technique (dichoptic
nonius lines). In the unequivocal stimuli (one depth plane), elicited
vergence was in accordance with earlier findings. If two depth planes
are presented, elicited vergence lies between the two planes,
approaching the plane with higher dot density and/or dot contrast. In
quantitative measurements, we show that the involved depth averaging
mechanism uses signal power per depth plane as a weight. Therefore,
the relative pulling strength of dot density as compared to dot
contrast follows a power law with exponent 2. We propose a population
code for vergence control based on disparity-tuned pools of units.
