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    Cannabis use and cognitive function: 8-year trajectory in a young adult cohort

    Access Status
    Fulltext not available
    Authors
    Tait, Robert
    Mackinnon, A.
    Christensen, H.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Tait, R. and Mackinnon, A. and Christensen, H. 2011. Cannabis use and cognitive function: 8-year trajectory in a young adult cohort. Addiction. 106 (12): pp. 2195-2203.
    Source Title
    Addiction
    DOI
    10.1111/j.1360-0443.2011.03574.x
    ISSN
    0965-2140
    School
    National Drug Research Institute (NDRI)
    URI
    http://hdl.handle.net/20.500.11937/40648
    Collection
    • Curtin Research Publications
    Abstract

    Aim To evaluate the relationship between change in cannabis use and changed cognitive performance over 8 years. Design We used survey methodology with a cohort design. Setting and participants An Australian community sample aged 20-24 years at baseline. Measures We assessed cognitive performance with the California Verbal Learning Test (CVLT) (immediate and delayed), Spot-the-Word test (STW), Symbol Digit Modality test (SDMT) and Digit Backwards (DB). Groups of cannabis users were defined from self-reports across three waves as: 'never' (n= 420) 'remain light' (n= 71), 'former light' (n= 231), 'remain heavy' (n= 60), 'former heavy' (n= 60) and 'always former' (since start of study) (n= 657). Planned contrasts within mixed model repeated-measures analysis of variance was used for longitudinal analysis with an adjusted alpha of 0.01. Findings Data were obtained from 2404 participants with 1978 (82.3%) completing wave 3. At baseline there were significant differences between cannabis groups on CVLT (immediate and delayed) and SDMT. However, after controlling for education, gender, gender × group and gender × wave, there were no significant between-group differences and only CVLT immediate recall reached adjusted statistically significant longitudinal change associated with changed cannabis use (group × wave P= 0.007). Specifically, former heavy users improved their performance relative to remaining heavy users (estimated marginal means: former heavy 6.1-7.5: remain heavy 6.4-6.6). Conclusions Cessation of cannabis use appears to be associated with an improvement in capacity for recall of information that has just been learned. No other measures of cognitive performance were related to cannabis after controlling for confounds. © 2011 The Authors, Addiction © 2011 Society for the Study of Addiction.

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