The ability to make discriminations of binocular disparity was investigated in 2-month-old infants by two methods: (a) fixation preference between patterns differing in the disparity they contained, and (b) recovery from habituation of high-amplitude sucking when there was a change in disparity in the visual reinforcer. The stimuli were random-dot stereograms. The results for both methods indicated that at least some infants of this age could perform stereoscopic discriminations and that both techniques were feasible for development for longitudinal studies of stereoscopic vision.
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