Drug polyconsumption is associated with increased synchronization of brain electrical-activity at rest and in a counting task

International Journal of Neural Systems
R Coullaut-ValeraD Papo

Abstract

Drug abusers typically consume not just one but several types of drugs, starting from alcohol and marijuana consumption, and then dramatically lapsing into addiction to harder drugs, such as cocaine, heroin, or amphetamine. The brain of drug abusers presents various structural and neurophysiological abnormalities, some of which may predate drug consumption onset. However, how these changes translate into modifications in functional brain connectivity is still poorly understood. To characterize functional connectivity patterns, we recorded Electroencephalogram (EEG) activity from 21 detoxified drug abusers and 20 age-matched control subjects performing a simple counting task and at rest activity. To evaluate the cortical brain connectivity network we applied the Synchronization Likelihood algorithm. The results showed that drug abusers had higher synchronization levels at low frequencies, mainly in the θ band (4-8 Hz) between frontal and posterior cortical regions. During the counting task, patients showed increased synchronization in the β (14-35 Hz), and γ (35-45 Hz) frequency bands, in fronto-posterior and interhemispheric temporal regions. Taken together 'slow-down' at rest and task-related 'over-exertion' could indicate tha...Continue Reading

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Citations

Oct 30, 2015·Expert Review of Neurotherapeutics·Liangsuo MaPonnada A Narayana
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Mar 25, 2021·Brain Communications·Sven Vanneste, Dirk De Ridder
Aug 3, 2021·Frontiers in Neuroscience·Tao ZhangHong Wang

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