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During concentration tasks, spontaneous attention shifts occurs towards selfcentered matters. Little is known about the brain oscillatory activity underlying these mental phenomena. We recorded 128-channels electroencephalographic activity from 12 subjects performing a breath-counting task. Subjects were instructed to press a button whenever, based on their introspective experience, they realized their attention had drifted away from the task. Theta (4-7Hz) and delta (2-3.5Hz) EEG activitydoi:10.1016/j.neuroimage.2010.10.008 pmid:20946963 fatcat:seqs76a2rbfb7dbtsoet4ngyou