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Behavioural activation repeatedly induced by a stimulant in rodents can persist in the absence of the drug if the animals are tested in the context where the drug was previously given, a phenomenon often explained in terms of Pavlovian conditioning. The aim of this study was to verify whether the amplitude of the putative CR (the drug-like activity) increases with the number of the US-CS associations...
The study tested the possibility of a positive relationship between the dose of cocaine and the size of the placebo effect generated after contextual sensitisation to the behavioural effects of cocaine. Male C57BL/6J mice were first injected (subcutaneous, s.c.) over seven successive daily sessions with saline or one of three doses of cocaine (2.5, 5 or 7.5 mg/kg), either in the test room or in the...
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