title: Alcohol increases spontaneous BOLD signal fluctuations in the visual network.
abstract: Brain activity during resting wakefulness is characterized by slow (<0.1Hz) fluctuations of blood oxygenation level-dependent (BOLD) functional magnetic resonance imaging (fMRI) signals that are topographically organized in discrete functional connectivity networks (resting-state networks, RSNs). The present study aimed at revealing possible network-specific alcohol-induced changes in resting-state fMRI (RS-fMRI) signals. RS-fMRI was carried out on eight healthy subjects in four consecutive 6-min sessions, one before and three after a 0.7 g/kg dose of ethyl alcohol. Control experiments were carried out in different days without alcohol administration. Independent component analysis (ICA) was performed on all experimental and control scans to extract individual and group-level RSN maps in a dynamic network analysis. Alcohol administration significantly increased the overall strength of the visual network ICA component, reaching the peak at 90 min. Within the visual network, the alcohol-induced increase was more pronounced in the primary regions of the occipital cortex and less pronounced in the secondary regions of the occipito-temporal cortex. Other major RSN components, such as the default-mode, the fronto-parietal, the sensori-motor, the self-referential and the auditory components, did not exhibit alcohol-induced changes during the same time window. Alcohol-induced effects on the resting-state functional connectivity of the visual network observed in the present study demonstrate that the visual system is a selective and primary target of acute alcohol administration. The strong enhancement of spontaneous BOLD fluctuations in the primary visual cortex in an acute alcoholic state may impair the normal activation response to visual stimuli and affect visual perception.
authors.affiliation: Division of Pharmacology, Department of Neuroscience, School of Medicine, University of Naples Federico II, Naples, Italy. fabrizio.esposito@unina.it
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Esposito
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Pignataro
authors.forename: Gianfranco
authors.initials: G
authors.lastname: Di Renzo
authors.forename: Alessandra
authors.initials: A
authors.lastname: Spinali
authors.forename: Antonella
authors.initials: A
authors.lastname: Paccone
authors.forename: Gioacchino
authors.initials: G
authors.lastname: Tedeschi
authors.forename: Lucio
authors.initials: L
authors.lastname: Annunziato
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D002492:Central Nervous System Depressants / Q000097:blood / Q000494:pharmacology*; D055724:Electrophysiological Phenomena; D000431:Ethanol / Q000097:blood / Q000494:pharmacology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D010100:Oxygen / Q000097:blood*; D025341:Principal Component Analysis; D014793:Visual Cortex / Q000187:drug effects / Q000378:metabolism; D014795:Visual Pathways / Q000187:drug effects* / Q000378:metabolism*; D014796:Visual Perception / Q000187:drug effects / Q000502:physiology
chemical_list: D002492:Central Nervous System Depressants; D000431:Ethanol; D010100:Oxygen