Dose-response analysis of the behavioral effects of diazepam: I. Learning and memory |
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Authors: | Ghoneim M. M. Hinrichs J. V. Mewaldt S. P. |
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Affiliation: | (1) Department of Anesthesia, University of Iowa, 52242 Iowa City, IA, USA;(2) Department of Psychology, University of Iowa, 52242 Iowa City, IA, USA;(3) Department of Psychology, Marshall University, 25701 Huntington, WV, USA |
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Abstract: | A total of 120 healthy volunteers were randomly assigned to four treatments (placebo, 0.1, 0.2, and 0.3 mg/kg) and three testing times (7 AM, 1 PM and 7 PM). Immediate and delayed free recall of word lists revealed consistent decreases in performance as oral diazepam dose increased from 0.1, 0.2, to 0.3 mg/kg. Paradoxically, as the dose increased, the number of predrug list words recalled also increased. A serial number-learning task displayed a pattern of delayed improvement of acquisition as the dose increased. Response times in a semantic-categories task were prolonged as the dose increased. Parallel recovery functions were observed for all doses and tasks. Full recovery after a single administration of 0.1, 0.2, and 0.3 mg/kg doses was estimated to occur after 3.5, 4.5, and 5.5 h, respectively. Several analyses were consistent with the view that acquisition and not retrieval was impaired by diazepam. There were no circadian interactions with the effects of the drug. |
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Keywords: | Diazepam Memory Learning Retrieval Dose response Recovery Circadian influences |
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