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• W1982483441 abstract "Albino rats were given extensive training in spaced responding, using a DRL 30 sec schedule of food reinforcement (only lever presses more than 30 sec apart were reinforced). All rats then went 12 days without behavioral testing. During this period half the rats received daily intragastric doses of delta-9-tetrahydrocannabinol (THC) and the rest equal volumes of the THC vehicle. On day 13, some rats received THC 3 hr before behavioral testing while others received only vehicle. The former showed a sharp increase in lever press rate over baseline levels, but the vehicle control rats were unaffected. The rats with 12 prior THC doses were no less affected than those with no previous drug history. Continued testing resulted in recovery of baseline performance within 5 sessions, again with no effect of previous drug history. Similar results were obtained with doses of 4 mg/kg and 16 mg/kg, though the drug's effects were more pronounced at the higher dose. These results demonstrate that performance in the drug state can be a far more important determinant of tolerance than mere exposure to THC. Drug administration was then suspended for 1 week. Rats that had become tolerant to 4 mg/kg THC were then redivided into 3 new groups. One group received daily doses of vehicle and DRL sessions, a second received DRL sessions without vehicle, and 1 group received neither vehicle nor DRL sessions for this week. Subsequent DRL testing after THC administration showed that only the groups receiving DRL sessions in the intervening week lost their previously acquired tolerance. Experience thus appears to play an important role in loss of tolerance to THC as well as in acquisition of tolerance." @default.
• W1982483441 created "2016-06-24" @default.
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• W1982483441 date "1976-09-01" @default.
• W1982483441 modified "2023-09-25" @default.
• W1982483441 title "Role of experience in acquisition and loss of tolerance to the effect of Δ-9-THC on spaced responding" @default.
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• W1982483441 doi "https://doi.org/10.1016/0091-3057(76)90078-2" @default.
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