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Related Experiment Videos

Marijuana effects on human forgetting functions.

Scott D Lane1, Don R Cherek, Lori M Lieving

  • 1Psychiatry & Behavioral Sciences, UTHSC-Houston, 1300 Mousund Street, Houston, TX 77030, USA. scott.d.lane@uth.tmc.edu

Journal of the Experimental Analysis of Behavior
|March 15, 2005
PubMed
Summary
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Acute marijuana use impairs the forgetting component of working memory, not initial stimulus discrimination. This study clarifies how delta-9-THC affects memory functions in humans.

Area of Science:

  • Cognitive Neuroscience
  • Behavioral Pharmacology
  • Cannabinoid Research

Background:

  • Acute marijuana administration is known to impair working memory.
  • Previous research has not clearly distinguished which memory components are affected by marijuana.

Purpose of the Study:

  • To investigate the acute effects of smoked marijuana on specific components of working memory.
  • To differentiate between delay-independent and delay-dependent memory processes affected by delta-9-tetrahydrocannabinol (delta9-THC).

Main Methods:

  • Utilized experimental analysis of behavior and signal detection theory.
  • Tested 5 human subjects using delayed match-to-sample tasks with varying retention intervals (0.5-24s).
  • Administered placebo, low-dose, and high-dose smoked marijuana varying in delta9-THC content.

Related Experiment Videos

Main Results:

  • Both low and high doses of delta9-THC impaired delay-dependent memory (forgetting/retrieval).
  • Delay-independent memory (initial discrimination) was not significantly affected by delta9-THC.
  • Impairment in forgetting functions was observed across all subjects.

Conclusions:

  • The findings indicate that delta-9-THC primarily affects the forgetting or retrieval aspects of working memory.
  • Results align with nonhuman studies on the cannabinoid system's role in memory.
  • This research elucidates a behavioral mechanism underlying marijuana's impact on memory performance.