VISION, CENTRALResting electroencephalogram alpha-power over posterior sites indexes baseline visual cortex excitabilityRomei, Vincenzoa b; Rihs, Toniaa b; Brodbeck, Verenaa b; Thut, Gregora b Author Information aFunctional Brain Mapping Laboratory, Department of Neurology, University Hospital Geneva bDepartment of Fundamental Neuroscience, University Medical School, Geneva, Switzerland Correspondence to Gregor Thut, Functional Brain Mapping Laboratory, Department of Neurology, University Hospital Geneva, 24, Rue Micheli du Crest, CH-1211 Geneva 14, Switzerland Tel: +41 22 379 57 28; e-mail: [email protected] Received 6 November 2007; accepted 11 November 2007 NeuroReport: January 22, 2008 - Volume 19 - Issue 2 - p 203-208 doi: 10.1097/WNR.0b013e3282f454c4 Buy Metrics Abstract Variations of oscillatory brain activity have been related to distinct functional states depending on the frequency of oscillations. In the α-band (about 8–14 Hz), decreased oscillatory activity is thought to reflect a state of enhanced cortical excitability, and increased activity to reflect a state of cortical idling or inhibition in which excitability is reduced, but the α/excitability link has not been probed directly. Here, we studied the relationship between resting oscillatory activity and visual cortex excitability across participants using electroencephalography and transcranial magnetic stimulation to the occipital pole. We found individual posterior α-band power to correlate with the individual threshold for eliciting illusory, transcranial magnetic stimulation-induced visual percepts. This provides direct support for an α/excitability link and for baseline states of the visual brain to vary across individuals. © 2008 Lippincott Williams & Wilkins, Inc.