Visual development in rhesus monkeys neonatally deprived of patterned light.

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Abstract
Twelve rhesus monkeys, deprived of pattern vision from the day of birth to 20 or 60 days of age, were tested daily for various untrained visual responses and were trained on form, striation, and brightness discriminations. The 20-and 60-day-old visually deprived Ss [subjects] were similar to newborn monkeys in rate of learning visual discriminations and in untrained visual behaviors. Acuity, brightness difference thresholds, and generalization of learned discriminations changed as Ss gained experience. Ocular tracking of patterns, visual placing, and visual cliff avoidance developed only after hours or days in patterned light. Savings In hours required relative to the normal developmental time course gave evidence for maturational as well as experiential contributions.

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