Cannabis use and cognitive function: 8-year trajectory in a young adult cohort
Robert J Tait, Andrew Mackinnon, Helen Christensen
Addiction | WILEY | Published : 2011
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 stud..View full abstract
Awarded by NHMRC
This study was supported by an NHMRC Program Grant 179805 and NHMRC Project Grant 157125. The sponsors had no role in the design, conduct or reporting of the research. Christensen is funded by NHMRC Senior Principal Research Fellowship 525411. Mackinnon acknowledges the support of the Colonial Foundation to Orygen Youth Health Research Centre. We thank Kaarin Anstey, Anthony Jorm, Bryan Rodgers, Trish Jacomb, Karen Maxwell and the PATH interviewing team for their contribution to the PATH Through Life Project.