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Cannabis Differentially Disrupts Neural Circuit Oscillatory Dynamics and Sensory Filtering in Rats: Implications for Schizophrenia

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dc.contributor.advisor Khokhar, Jibran Jenkins, Bryan William 2022-10-25T19:26:58Z 2022-10-25T19:26:58Z 2022-10 2022-10-21
dc.description.abstract Neural circuit oscillations are promising targets for investigating changes in brain connectivity underlying the association between cannabis use and schizophrenia. Reflecting the coordination of multiple neurotransmitter systems implicated in schizophrenia, aberrant neural circuit oscillatory activity often corresponds to schizophrenia-like changes in behaviour and is also observed after cannabinoid exposure. However, the relative effects of vapourized phytocannabinoids on schizophrenia-like neural circuit oscillations and cognitive processing remain unknown. The studies in this thesis aimed to extend existing preclinical evidence of aberrant neural circuit oscillations as an integral mechanism linking cannabis use and schizophrenia, by characterizing the influence of phytocannabinoid abundance on altered corticolimbic neural circuit oscillatory and sensory filtering deficits relevant to schizophrenia. In the second chapter, two within-subject studies were used to determine that isolate THC vapour exposure reduces neural circuit oscillatory power and coherence in experimentally naïve male rats and cannabis flower vapour exposure dose-dependently disrupts sensory filtering selectively for rats with reduced baseline performance. In the third chapter, two within-subject studies were used to determine that cannabis flower vapour exposure reduces oscillatory power in experimentally naïve male rats, as well as in a neurodevelopmental rat model of schizophrenia, and exposure to a cannabis flower vapour with different amounts of cannabinoids has a differential effect, without either exposure disrupting sensory filtering. Taken together, the effects of phytocannabinoid exposure on neural circuit oscillations and associated sensory filtering are highly dependent on the type, dose, and relative abundance of phytocannabinoid exposure, as well as baseline differences in cognition. Altered neural circuit oscillations may also be a biomarker for the effects of cannabis when cognitive disruptions are not evident. en_US
dc.description.sponsorship This work was supported by Canadian Institutes of Health Research (CIHR) Project Grant award to Jibran Khokhar (PJT-436591) and a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant to Melissa Perreault (401359) en_US
dc.language.iso en en_US
dc.publisher University of Guelph en
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International *
dc.rights.uri *
dc.subject mental health en_US
dc.subject behavioural neuroscience en_US
dc.subject neuropsychopharmacology en_US
dc.subject addiction en_US
dc.subject electrophysiology en_US
dc.title Cannabis Differentially Disrupts Neural Circuit Oscillatory Dynamics and Sensory Filtering in Rats: Implications for Schizophrenia en_US
dc.type Thesis en Neuroscience en_US Doctor of Philosophy en_US Department of Biomedical Sciences en_US
dcterms.relation Jenkins BW, Buckhalter S, Perreault ML, Khokhar JY. Cannabis Vapor Exposure Alters Neural Circuit Oscillatory Activity in a Neurodevelopmental Model of Schizophrenia: Exploring the Differential Impact of Cannabis Constituents. Schizophr Bull Open. 2021 Nov 20;3(1):sgab052. en_US University of Guelph en

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Attribution-NonCommercial-NoDerivatives 4.0 International Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International
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