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The role of discriminative stimuli in modulating drug action

  • Victor G. Laties
Part of the FASEB Monographs book series (FASEBM, volume 4)

Abstract

Behavior reinforced in the presence of a stimulus comes under the control of the stimulus. A drug can then modify that control and, therefore, modify the behavior itself. Studies over the past 2 decades have shown that the nature of the controlling (or discriminative) stimulus can govern the degree to which drugs change performance. These experiments usually have compared behavior on various schedules of reinforcement with and without added discriminative stimuli. For instance, pigeons that had been trained on a fixed-interval schedule showed great changes in response distribution after amphetamine and scopolamine. The same birds, when performing on a fixed-interval schedule to which time-correlated discriminative stimuli had been added, showed smaller changes in response distribution. Other pigeons were trained to make a minimum number of consecutive responses on one key before a peck on a second key would be reinforced; d-amphetamine and scopolamine led to pronounced increases in premature switching. Adding a discriminative stimulus when the response requirement was fulfilled increased the likelihood that a switch would occur only after the appropriate number of pecks had been emitted. It also attenuated the effects of the drugs. The presence of discriminative stimuli did not make as large a difference in performance in either of these experiments when chlorpromazine and promazine were studied. In general, work with other schedules of reinforcement supports the conclusion that behavior under strong external stimulus control is less apt to be readily affected by many drugs. Addition of the discriminative stimulus can also “improve” the behavior of pigeons that have been given enough methylmercury to increase greatly the variability of their performance. — Laties, V. G. The role of discriminative stimuli in modulating drug action. Federation Proc. 34: 1880–1888, 1975.

Keywords

Stimulus Control Discriminative Stimulus Multiple Schedule Conditional Probability Function Criminative Stimulus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

FCN

fixed consecutive number

DRL

differential reinforcement of low rate

FR1

fixed ratio one.

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Copyright information

© Springer Science+Business Media New York 1975

Authors and Affiliations

  • Victor G. Laties
    • 1
    • 2
    • 3
  1. 1.Department of Radiation Biology and BiophysicsUniversity of RochesterRochesterUSA
  2. 2.Department of Pharmacology and ToxicologyUniversity of RochesterRochesterUSA
  3. 3.Department of PsychologyUniversity of RochesterRochesterUSA

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