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Articles, Behavioral/Systems/Cognitive

Dysfunctional Prefrontal Cortical Network Activity and Interactions following Cannabinoid Receptor Activation

Michal T. Kucewicz, Mark D. Tricklebank, Rafal Bogacz and Matthew W. Jones
Journal of Neuroscience 26 October 2011, 31 (43) 15560-15568; https://doi.org/10.1523/JNEUROSCI.2970-11.2011
Michal T. Kucewicz
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Mark D. Tricklebank
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Rafal Bogacz
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Matthew W. Jones
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Abstract

Coordinated activity spanning anatomically distributed neuronal networks underpins cognition and mediates limbic–cortical interactions during learning, memory, and decision-making. We used CP55940, a potent agonist of brain cannabinoid receptors known to disrupt coordinated activity in hippocampus, to investigate the roles of network oscillations during hippocampal and medial prefrontal cortical (mPFC) interactions in rats. During quiet wakefulness and rest, CP55940 dose-dependently reduced 0.1–30 Hz local field potential power in CA1 of the hippocampus while concurrently decreasing 30–100 Hz power in mPFC; these contrasting population-level effects were paralleled by differential effects on underlying single-unit activity in the two structures. During decision-making phases of a spatial working memory task, CP5540-induced deficits in hippocampal theta and prefrontal gamma oscillations were observed alongside disrupted theta-frequency coherence between the two structures. These changes in coordinated limbic–cortical network activities correlated with (1) reduced accuracy of task performance, (2) impaired phase-locking of prefrontal single-unit spiking to the local gamma and hippocampal theta rhythms, and (3) impaired task-dependent activity in a subset of mPFC units. In addition to highlighting the importance of CA1–mPFC network oscillations for cognition, these results implicate disrupted theta-frequency coordination of CA1–mPFC activity in the cognitive deficits caused by exogenous activation of brain cannabinoid receptors.

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The Journal of Neuroscience: 31 (43)
Journal of Neuroscience
Vol. 31, Issue 43
26 Oct 2011
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Dysfunctional Prefrontal Cortical Network Activity and Interactions following Cannabinoid Receptor Activation
Michal T. Kucewicz, Mark D. Tricklebank, Rafal Bogacz, Matthew W. Jones
Journal of Neuroscience 26 October 2011, 31 (43) 15560-15568; DOI: 10.1523/JNEUROSCI.2970-11.2011

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Dysfunctional Prefrontal Cortical Network Activity and Interactions following Cannabinoid Receptor Activation
Michal T. Kucewicz, Mark D. Tricklebank, Rafal Bogacz, Matthew W. Jones
Journal of Neuroscience 26 October 2011, 31 (43) 15560-15568; DOI: 10.1523/JNEUROSCI.2970-11.2011
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