Summary of research findings on marijuana Review of literature ...

Learning, Memory and other higher functions• sensory sensitivity in lab tests not heightened;reported effects presumably at perceptual level• lab tests confirm overestimation <strong>of</strong> elapsed time• Most Ss show little effect on tests requiring shorttermvigilance / attention; but performance falls <strong>of</strong>f ifconcentration required longer• Impairment is most obvious in short-term memory:dose-dependent impairment in digit-span tests,word list tests• predominant error is <strong>of</strong> “intrusion”: reportingitems that weren’t given• deficits become more pronounced if distractingstimuli presented during delay interval