The Reinforcing Effect of Changes in Illumination on Lever-Pressing in the Monkey
- 1 June 1956
- journal article
- research article
- Published by University of Illinois Press in The American Journal of Psychology
- Vol. 69 (2), 288-290
- https://doi.org/10.2307/1418162
Abstract
Twenty rhesus monkeys were placed in a situation in which pressing a lever would produce a change in the illumination. For 10 of them the change was an increment, for the other 10, a decrement. Eleven control animals were placed in the same situation but for them no change in illumination followed lever-pressing. Results indicate an increase in lever-pressing when followed by change in illumination, either an increment or a decrement.Keywords
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