A physiological explanation of infants' early visual development.

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Abstract
A physiological explantation of infants'' early visual development was proposed based on recent evidence that the cat''s visual system contains at least 3 separate pathways, pathways which subserve different functions and develop at different rates. Several lines of evidence suggest the same is true in humans. Data from human newborns suggest that at birth 2 of these pathways (the X-pathway to the cortex and the Y-pathways directly to the superior colliculus and pretectum) are functional, but that the 3rd, the Y-pathway to the cortex, is not. Striking changes at 2 mo. appear to reflect the drawning influence of that Y-pathway to the cortex.