Abstract：
RATIONALE:Although some aspects of memory functions are known to be acutely impaired by delta(9)-tetrahydrocannabinol (delta(9)-THC; the main active constituent of marijuana), effects on other aspects of memory are not known and the time course of functional impairments is unclear. OBJECTIVE:The present study aimed to detail the acute and residual cognitive effects of delta(9)-THC in infrequent cannabis users. METHODS:A balanced, double-blind cross-over design was used to compare the effects of 7.5 mg and 15 mg delta(9)-THC with matched placebo in 15 male volunteers. Participants were assessed pre and 1, 2, 4, 6, 8, 24 and 48 h post-drug. RESULTS:Delta(9)-THC 15 mg impaired performance on two explicit memory tasks at the time of peak plasma concentration (2 h post-drug). At the same time point, performance on an implicit memory task was preserved intact. The higher dose of delta(9)-THC resulted in no learning whatsoever occurring over a three-trial selective reminding task at 2 h. Working memory was generally unaffected by delta(9)-THC. In several tasks, delta(9)-THC increased both speed and error rates, reflecting "riskier" speed-accuracy trade-offs. Subjective effects were also most marked at 2 h but often persisted longer, with participants rating themselves as "stoned" for 8 h. Participants experienced a strong drug effect, liked this effect and, until 4 h, wanted more oral delta(9)-THC. No effects of delta(9)-THC were found 24 or 48 h following ingestion indicating that the residual effects of oral delta(9)-THC are minimal. CONCLUSIONS:These data demonstrate that oral delta(9)-THC impairs episodic memory and learning in a dose-dependent manner whilst sparing perceptual priming and working memory.
journal_name
Psychopharmacology (Berl)journal_title
Psychopharmacologyauthors
Curran HV,Brignell C,Fletcher S,Middleton P,Henry Jdoi
10.1007/s00213-002-1169-0subject
Has Abstractpub_date
2002-10-01 00:00:00pages
61-70issue
1eissn
0033-3158issn
1432-2072journal_volume
164pub_type
临床试验,杂志文章abstract：:The [14C]-2-deoxyglucose method was used to map the in vivo metabolic response of glucose to savoxepine, a novel tetracyclic cyano-dibenzoxepino-azepine. Savoxepine is reported to have higher affinity for dopamine (DA) receptors in the hippocampus than in the striatum and hence should have dose-dependent, anatomically...
journal_title：Psychopharmacology
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