Prestimulus EEG alpha oscillations modulate task-related fMRI BOLD responses to auditory stimuli

NeuroImage
Jennifer M WalzPaul Sajda

Abstract

EEG alpha-band activity is generally thought to represent an inhibitory state related to decreased attention and play a role in suppression of task-irrelevant stimulus processing, but a competing hypothesis suggests an active role in processing task-relevant information - one in which phase dynamics are involved. Here we used simultaneous EEG-fMRI and a whole-brain analysis to investigate the effects of prestimulus alpha activity on the event-related BOLD response during an auditory oddball task. We separately investigated the effects of the posterior alpha rhythm's power and phase on activity related to task-relevant stimulus processing and also investigated higher-level decision-related processing. We found stronger decision-related BOLD activity in areas late in the processing stream when subjects were in the high alpha power state prior to stimulus onset, but did not detect any effect in primary sensory regions. Our phase analysis revealed correlates in the bilateral thalamus, providing support for a thalamo-cortical loop in attentional modulations and suggesting that the cortical alpha rhythm acts as a cyclic modulator of task-related responses very early in the processing stream. Our results help to reconcile the competin...Continue Reading

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Citations

Mar 10, 2016·Frontiers in Psychology·Guy CheronBernard Dan
May 31, 2017·ELife·Nicholas L BalderstonChristian Grillon
Jan 11, 2019·Psychiatry and Clinical Neurosciences·Kuk-In JangJeong-Ho Chae
Dec 12, 2018·Nature Methods·Oscar EstebanKrzysztof J Gorgolewski
Apr 17, 2020·Neuroscience and Biobehavioral Reviews·Boris GourévitchJos J Eggermont
Apr 14, 2019·NeuroImage·Alireza ModirshanechiHamid Aghajan
Jun 25, 2021·Neuroscience of Consciousness·Catriona L ScrivenerEtienne B Roesch
Sep 4, 2019·Journal of Cognitive Neuroscience·Daniele MiglioratiMarcello Costantini
Mar 25, 2021·Annual Review of Neuroscience·Marios G PhiliastidesPaul Sajda

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