title: Event-related EEG time-frequency PCA and the orienting reflex to auditory stimuli.
abstract: We recently reported an auditory habituation series with counterbalanced indifferent and significant (counting) instructions. Time-frequency (t-f) analysis of electrooculogram-corrected EEG was used to explore event-related synchronization (ERS)/desynchronization (ERD) in four EEG bands using arbitrarily selected time epochs and traditional frequency ranges. ERS in delta, theta, and alpha, and subsequent ERD in theta, alpha, and beta, showed substantial decrement over trials, yet effects of stimulus significance (count vs. no-task) were minimal. Here, we used principal components analysis (PCA) of the t-f data to investigate the natural frequency and time combinations involved in such stimulus processing. We identified four ERS and four ERD t-f components: six showed decrement over trials, four showed count > no-task effects, and six showed Significance × Trial interactions. This increased sensitivity argues for the wider use of our data-driven t-f PCA approach.
authors.affiliation: Centre for Psychophysics, Psychophysiology, and Psychopharmacology, Brain & Behaviour Research Institute and School of Psychology, University of Wollongong, Wollongong, Australia.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Barry
authors.forename: Frances M
authors.initials: FM
authors.lastname: De Blasio
authors.forename: Edward M
authors.initials: EM
authors.lastname: Bernat
authors.forename: Genevieve Z
authors.initials: GZ
authors.lastname: Steiner
mesh_terms: D000161:Acoustic Stimulation; D001307:Auditory Perception / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009949:Orientation / Q000502:physiology*; D025341:Principal Component Analysis; D012018:Reflex / Q000502:physiology*; D055815:Young Adult
keywords: Electroencephalogram (EEG); Event-related desynchronization (ERD); Habituation; Orienting reflex (OR); Time-frequency analysis