Abstract
Under controlled laboratory conditions, eight adult subjects smoked placebo and three different potencies of marijuana cigarettes ranging in Δ9 THC content. Immediately following smoking, subjects were exposed to a laboratory task that provided concurrently available response options. One option systematically decreased in reinforcement frequency throughout the session, and thus required a reallocation of behavior to the non-decreasing option to maximize monetary earnings. After smoking the two highest doses (1.77% and 3.58% Δ9 THC) subjects earned fewer reinforcers and allocated a higher proportion of responding to the decreasing option, compared with placebo and the lowest dose. The difference in reinforcers earned could not be accounted for by a change in response rates. Quantitative and graphical analyses revealed that the higher doses produced considerable periods of time spent on the decreasing option despite earning few reinforcers. The data are discussed with regard to marijuana effects on dopamine/cannabinoid systems and adaptive behavior change.
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Acknowledgements
This study was supported by grant DA 12968 from the National Institutes of Health. We thank Joel L. Steinberg, M.D., for helpful scientific advice, and Sheila White and Jennifer Sharon for technical assistance.
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Lane, S., Cherek, D. Marijuana Effects on Sensitivity to Reinforcement in Humans. Neuropsychopharmacol 26, 520–529 (2002). https://doi.org/10.1016/S0893-133X(01)00375-X
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DOI: https://doi.org/10.1016/S0893-133X(01)00375-X
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