title: Propagation of EEG activity during finger movement and its imagination.
abstract: We investigated the pattern of EEG activity propagation in the beta and gamma band during a finger movement experiment and imagination of that task. The data were analyzed by means of a short-time directed transfer function (SDTF) based on a multivariate autoregressive model. The signals from the right (or left) hemisphere were processed simultaneously (not pairwise), which is crucial for obtaining a correct picture of EEG activity transmissions. The pattern of propagation in the beta band involved for both tasks a decrease of the propagation from the motor areas during the execution of the movement - less pronounced in the case of imagination. The performance of the motion was mainly connected with a short outburst of gamma activity from the hand sensorimotor areas. In case of imagination the gamma outflow lasted longer and concerned larger brain areas.
authors.affiliation: Department of Biomedical Physics, Institute of Experimental Physics, Warsaw University, ul. Hoza 69, 00-682 Warsaw, Poland. rkus@fuw.edu.pl.
authors.forename: Rafał
authors.initials: R
authors.lastname: Kuś
authors.forename: Józef S
authors.initials: JS
authors.lastname: Ginter
authors.forename: Katarzyna J
authors.initials: KJ
authors.lastname: Blinowska
mesh_terms: D000328:Adult; D001931:Brain Mapping; D004569:Electroencephalography; D005260:Female; D005385:Fingers; D007839:Functional Laterality; D006801:Humans; D007092:Imagination / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D015999:Multivariate Analysis; D012815:Signal Processing, Computer-Assisted