EEG alpha phase shifts during transition from wakefulness to drowsiness

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
Aleksandar KalauziTijana Bojić

Abstract

Phases of alpha oscillations recorded by EEG were typically studied in the context of event or task related experiments, rarely during spontaneous alpha activity and in different brain states. During wake-to-drowsy transition they change unevenly, depending on the brain region. To explore their dynamics, we recorded ten adult healthy individuals in these two states. Alpha waves were treated as stable frequency and variable amplitude signals with one carrier frequency (CF). A method for calculating their CF phase shifts (CFPS) and CF phase potentials (CFPP) was developed and verified on surrogate signals as more accurate than phase shifts of Fourier components. Probability density estimate (PDE) of CFPS, CFPP and CF phase locking showed that frontal and fronto-temporal areas of the cortex underwent more extensive changes than posterior regions. The greatest differences were found between pairs of channels involving F7, F8, F3 and F4 (PDE of CFPS); F7, F8, T3 and T4 (CFPP); F7, F8, F3, F4, C3, C4 and T3 (decrease in CF phase locking). A topographic distribution of channels with above the average phase locking in the wake state revealed two separate regions occupying anterior and posterior brain areas (with intra regional and inte...Continue Reading

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Citations

Sep 21, 2013·BMC Neuroscience·Vernon LawhernKay A Robbins
Dec 3, 2014·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Aleksandar KalauziTijana Bojić
Jun 5, 2015·Journal of Clinical and Experimental Hepatology·Piero Amodio, Sara Montagnese
Nov 8, 2017·Medical & Biological Engineering & Computing·Aleksandar KalauziTijana Bojić

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