Abstract

A 10-week-old rhesus monkey was given a mild electric shock contingent on sucking her thumb or large toe. This totally suppressed sucking during several hours of testing, and apparently reduced sucking in the home cage immediately after testing. A sound which was inadvertently paired with shock during training was used during extinction of sucking-suppression to reduce the occurrence of another behavior. This indicated that sound had become a secondary punishing stimulus. Extinction procedures brought a return of sucking in both test and home environments.

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