Abstract
Responding of rats (n=5) was maintained under DRL (lever) and Time-Delay (nose-key) schedules of food presentation in different experimental chambers during two separate daily sessions. Tolerance that developed to rate-decreasing effects of phencyclidine for nose-key pressing under the Time-Delay schedule did not extend to effects of phencyclidine on lever pressing under the DRL schedule. In a second experiment, both lever and nose-key pressing of rats were maintained under individual and multiple fixed-ratio schedules. One group of animals (n=5) experienced both the individual and the multiple schedules in the same experimental chamber and another group (n=5) experienced the individual and the multiple schedules in different experimental chambers. Tolerance that developed to behavioral effects of phencyclidine during the individual schedule did not extend to responding on even the same manipulandum under the multiple schedule in a different experimental chamber. In contrast, tolerance that developed to behavioral effects of phencyclidine during the individual schedule did extend to responding on even the different manipulandum under the multiple schedule in the same experimental chamber. Thus, tolerance that developed in the environment that was coincident with the pharmacologic actions of phencyclidine did not extend to similar operants in adifferent environmental condition, but did extend even to a different operant and schedule context in thesame environmental condition.
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Animals used in this study were maintained in accordance with guidelines of the Animal Care Committee of the Worcester Foundation for Experimental Biology and of the “Guide for Care and Use of Laboratory Animals” of the Institute of Laboratory Animal Resources, National Research Council, Department of Health, Education and Welfare, Publication Number (NIH)85-23, revised 1985
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Smith, J.B. Situational specificity of tolerance to effects of phencyclidine on responding of rats under fixed-ratio and spaced-responding schedules. Psychopharmacology 103, 121–128 (1991). https://doi.org/10.1007/BF02244086
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DOI: https://doi.org/10.1007/BF02244086