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Operant responding for complex visual stimuli showed expected changes as a function of visual deprivation manipulations in infant rhesus monkeys reared with normal pattern vision. Infants reared with restricted access to patterned light showed no systematic changes consequent to the same manipulations.

Responding for complex visual stimuli in rhesus monkeys reared under different early visual conditions showed persisting effects of early rearing conditions at later ages. Animals reared for a period after birth without pattern vision showed less stimulation seeking than did a monkey reared with unrestricted access to perceptual stimuli. Limited enrichment provided by a 10-min daily exposure to a laboratory environment of an otherwise visual pattern-restricted animal also appeared to elevate the monkey 's stimulation-seeking behavior. Type of stimuli affected rate of responding in all but the younger animals in the restricted group.