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Olla P, Rykulski N, Hurtubise JL, Bartol S, Foote R, Cutler L, Abeare K, McVinnie N, Sabelli AG, Hastings M, Erdodi LA. Short-term effects of cannabis consumption on cognitive performance in medical cannabis patients. APPLIED NEUROPSYCHOLOGY-ADULT 2019; 28:647-657. [PMID: 31790276 DOI: 10.1080/23279095.2019.1681424] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
This observational study examined the acute cognitive effects of cannabis. We hypothesized that cognitive performance would be negatively affected by acute cannabis intoxication. Twenty-two medical cannabis patients from Southwestern Ontario completed the study. The majority (n = 13) were male. Mean age was 36.0 years, and mean level of education was 13.7 years. Participants were administered the same brief neurocognitive battery three times during a six-hour period: at baseline ("Baseline"), once after they consumed a 20% THC cannabis product ("THC"), and once again several hours later ("Recovery"). The average self-reported level of cannabis intoxication prior to the second assessment (i.e., during THC) was 5.1 out of 10. Contrary to expectations, performance on neuropsychological tests remained stable or even improved during the acute intoxication stage (THC; d: .49-.65, medium effect), and continued to increase during Recovery (d: .45-.77, medium-large effect). Interestingly, the failure rate on performance validity indicators increased during THC. Contrary to our hypothesis, there was no psychometric evidence for a decline in cognitive ability following THC intoxication. There are several possible explanations for this finding but, in the absence of a control group, no definitive conclusion can be reached at this time.
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Affiliation(s)
| | - Nicholas Rykulski
- College of Human Medicine, Michigan State University, Lansing, MI, USA
| | | | - Stephen Bartol
- School of Medicine, Wayne State University, Detroit, MI, USA
| | | | - Laura Cutler
- Department of Psychology, University of Windsor, Windsor, ON, Canada
| | - Kaitlyn Abeare
- Department of Psychology, University of Windsor, Windsor, ON, Canada
| | - Nora McVinnie
- Brain-Cognition-Neuroscience Program, University of Windsor, Windsor, ON, Canada
| | - Alana G Sabelli
- Department of Psychology, University of Windsor, Windsor, ON, Canada
| | - Maurissa Hastings
- Department of Psychology, University of Windsor, Windsor, ON, Canada
| | - Laszlo A Erdodi
- Department of Psychology, University of Windsor, Windsor, ON, Canada
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Casswell S. Cannabis intoxication: effects of monetary incentive on performance, a controlled investigation of behavioural tolerance in moderate users of cannabis. Percept Mot Skills 1975; 41:423-34. [PMID: 1187298 DOI: 10.2466/pms.1975.41.2.423] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The study examined the effect of monetary incentive on the performance of five tasks after two heterogeneous groups of experienced users of cannabis and previously naive subjects had smoked placebo material and two dose levels of cannabis. The performance of the motivated subjects was compared with that of two non-motivated matched groups. Dose-related impairment was found on four of the five tasks, supporting previous findings of cannabis-induced impairment of short-term memory, goal-directed behavior and choice reaction times. Results for three of the tasks suggested that the performance of the motivated subjects was less affected by the drug than was the performance of the non-motivated subjects. There was no difference between the performance of subjects naive and experienced with respect to drug use.
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