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EFFECTS OF COCAINE ON BRIEFLY SIGNALED VERSUS COMPLETELY SIGNALED DELAYS TO REINFORCEMENT
Author(s) -
Walker Diana J.,
Branch Marc N.
Publication year - 1996
Publication title -
journal of the experimental analysis of behavior
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.75
H-Index - 61
eISSN - 1938-3711
pISSN - 0022-5002
DOI - 10.1901/jeab.1996.65-375
Subject(s) - reinforcement , psychology , computer science , neuroscience , cognitive psychology , social psychology
Key pecking by 4 pigeons was maintained by a multiple schedule consisting of two variable‐interval 60‐s schedules wherein each food presentation followed a nonresetting 27‐s delay that was either briefly signaled at its outset or completely signaled. Brief‐signal duration was adjusted so that response rates maintained by the briefly and completely signaled delays of reinforcement were similar. In general, acute administration of small to intermediate doses (0.3 to 3.0 mg/kg) of cocaine produced either small increases in response rates in both components or no change, and larger doses (5.6 to 13.0 mg/kg) decreased response rates. Chronic (i.e., daily) cocaine administration (10.0 mg/kg) resulted in tolerance to the rate‐decreasing effects in both components. Cocaine's effects were generally similar whether delays were completely or briefly signaled. Discontinuation of cocaine administration and subsequent removal of the delay signals also had similar effects in both components of the multiple schedule. Taken together, these results are consistent with the view that the two types of delay signals were equally effective in maintaining responding during the variable‐interval schedules.