نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 استادیار، گروه مهندسی ورزش، دانشکدهی علوم مهندسی، دانشکدگان فنی، دانشگاه تهران، تهران، ایران
2 دکتری تخصصی، پژوهشکدهی علوم شناختی و مغز، دانشگاه شهید بهشتی، تهران، ایران
کلیدواژهها
موضوعات
عنوان مقاله English
نویسندگان English
Over the past twenty years, methamphetamine use disorder (MUD) has become a significant public health challenge, with prevalence rates soaring to epidemic levels. Understanding the brain functional changes of MUD subjects can pave the way for earlier and more accurate diagnosis, development of more effective treatments, preventative strategies, and promote long-term recovery. Hence, in this study, the graph global metrics were extracted from functional connectivity matrices of the MUD and healthy controls (HC) groups and compared between two groups in order to find out if there are changes in the brain global topology of the MUD subjects. In a detailed explanation, resting-state electroencephalography (EEG) data (with eyes open) of 14 MUD participants and 17 age and sex matched HCs were recorded and preprocessed. For each individual, the functional connectivity matrix was calculated using the wPLI method in Delta, Theta, Alpha I, Alpha II, Beta I, Beta II, Beta III, Beta IV, and Gamma frequency bands. From each connectivity matrix, 10 global metrics of graph, including global efficiency, eccentricity, radius, diameter, assortativity coefficient, clustering coefficient, eigenvector centrality, modularity, betweenness centrality, and degree, were extracted. Statistically significant changes in brain global topology of MUD subjects were found in high frequencies, i.e., Beta IV (25-30 Hz) and Gamma (30-45 Hz). The efficiency, clustering coefficient, modularity, betweenness centrality, and degree were higher for MUDs whereas the eccentricity and radius were higher for HCs. These changes may reflect disrupted balance between segregation and integration of brain function in MUD subjects. Also, these significant metrics showed significant correlations with impulsivity scores. The observed results in this study demonstrate that methamphetamines can affect global topology of functional connectivity, which in turn may lead to more impulsivity of MUD subjects. This study justifies further studies into the effects of MUD on brain global topology.
کلیدواژهها English