title: Phase shifts in alpha-frequency rhythm detected in electroencephalograms influence reaction time.
abstract: Although the phase shifts in ongoing oscillations seen in electroencephalograms (EEGs) and magnetoencephalograms are an important factor in discussions of phase dynamics, such as synchrony and reset, few studies have focused specifically on the phase shift. Here we investigate the relationship between phase shifts in alpha-frequency rhythms and reaction times during a visual simple reaction task by applying our previously described method (Naruse et al., 2013), which enables detection of phase shifts from a single EEG trial. In the left, parietal, and occipital areas, the reaction times in the trials in which phase shifts were detected before the button press were significantly longer than in those in which phase shifts were not so detected. These results indicate that phase shifts in the alpha and mu rhythms relate to variability in reaction times.
authors.affiliation: Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology and Osaka University, Kobe, Hyogo 651-2492, Japan. Electronic address: y_naruse@nict.go.jp.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Naruse
authors.affiliation: Japan Society for the Promotion of Science, Kojimachi, Tokyo 102-0083, Japan; Brain Science Institute, Tamagawa University, Machida, Tokyo 194-8610, Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Takiyama
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan; RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Okada
authors.affiliation: Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology and Osaka University, Kobe, Hyogo 651-2492, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Umehara
authors.affiliation: Graduate School of Information Systems, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Sakaguchi
mesh_terms: D000513:Alpha Rhythm / Q000502:physiology*; D004569:Electroencephalography; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008297:Male; D016011:Normal Distribution; D011930:Reaction Time / Q000502:physiology*; D055815:Young Adult
keywords: Alpha rhythm; Bayes’ theorem; EEG; Mu rhythm; Phase shift; Reaction time; State-space model