title: Alpha detection: some comments on Hardt and Kamiya, "Conflicting results in EEG alpha feedback studies".
abstract: The problem of defining EEG alpha activity, and of detecting and measuring it, is outlined. Some advantages of a threshold method are presented and compared with an amplitude-integration method. Characteristics of percent-time scoring, based upon observable alpha spindles in the waking EEG, are discussed. A probability distribution of percent-time alpha as a function of detection threshold is derived and compared with empirical data.
mesh_terms: D000200:Action Potentials; D000513:Alpha Rhythm; D001676:Biofeedback, Psychology; D006801:Humans; D008959:Models, Neurological