Self-maintained sensory input and sensory deprivation in monkeys: A behavioral and neuropharmacological study.

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Abstract
Monkeys in a dark box learned to bar-press for a reward of 0.5 of light. Rate of response correlated positively with length of preceding sensory deprivation, and was decreased monotonically by adding various amounts of ambient light. Amphetamine increased the rate of response. Recordings from diffuse systems of thalamus and brainstem show that responses tend to follow an increase in the amount of very high voltage, slow activity. (PsycINFO Database Record (c) 2006 APA, all rights reserved)