title: Multiple gamma oscillations in the brain: a new strategy to differentiate functional correlates and P300 dynamics.
abstract: Brain oscillations in the gamma frequency band, - i.e. oscillations greater than 25 Hz - have attracted increasing attention over the last few decades in the research of sensory-cognitive processes. In the neuroscience research literature, a great number of reports aim to describe the functional correlates of oscillatory responses in the gamma frequency window. However, analysis using a broadband frequency window often leads to divergent functional interpretations and controversies. In order to provide a more exact approach, we have used a strategy by defining multiple frequency and multiple time windows according to the combined analysis of conventional power spectral windows, frequency adaptive multiple filters, and inter-trial coherence. The analysis in frequency windows of 25-30 Hz, 30-35 Hz, and 40-48 Hz enables the investigator to provide a distinction of cognitive and/or sensory responses. Moreover, according to topological differentiation and the consideration of neuroanatomic pathways, more reliable interpretations of gamma responses are reached.
authors: Brain Dynamics, Cognition and Complex Systems Research Center, Istanbul Kultur University, Istanbul 34156, Turkey. Electronic address: e.basar@iku.edu.tr.
authors: Erol
authors: E
authors: Başar
authors: Brain Dynamics, Cognition and Complex Systems Research Center, Istanbul Kultur University, Istanbul 34156, Turkey.
authors: Elif
authors: E
authors: Tülay
authors: Brain Dynamics, Cognition and Complex Systems Research Center, Istanbul Kultur University, Istanbul 34156, Turkey.
authors: Bahar
authors: B
authors: Güntekin
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D005260:Female; D005583:Fourier Analysis; D065818:Gamma Rhythm / Q000502:physiology*; D006801:Humans; D008297:Male; D017711:Nonlinear Dynamics; D010775:Photic Stimulation; D013223:Statistics as Topic; D014796:Visual Perception / Q000502:physiology; D055815:Young Adult
keywords: EEG; ERSP; Event related oscillations; Gamma; ITC; P300