Stimulus-driven brain rhythms within the alpha band: The attentional-modulation conundrum

Christian Keitel (Lead / Corresponding author), Anne Keitel, Christopher Benwell, Christoph Daube, Gregor Thut, Joachim Gross

Research output: Contribution to journalArticle

Abstract

Two largely independent research lines use rhythmic sensory stimulation to study visual processing. Despite the use of strikingly similar experimental paradigms, they differ crucially in their notion of the stimulus-driven periodic brain responses: One regards them mostly as synchronised (entrained) intrinsic brain rhythms; the other assumes they are predominantly evoked responses (classically termed steady-state responses, or SSRs) that add to the ongoing brain activity. This conceptual difference can produce contradictory predictions about, and interpretations of, experimental outcomes. The effect of spatial attention on brain rhythms in the alpha-band (8 - 13 Hz) is one such instance: alpha-range SSRs have typically been found to increase in power when participants focus their spatial attention on laterally presented stimuli, in line with a gain control of the visual evoked response. In nearly identical experiments, retinotopic decreases in entrained alpha-band power have been reported, in line with the inhibitory function of intrinsic alpha. Here we reconcile these contradictory findings by showing that they result from a small but far-reaching difference between two common approaches to EEG spectral decomposition. In a new analysis of previously published EEG data, recorded during bilateral rhythmic visual stimulation, we find the typical SSR gain effect when emphasising stimulus-locked neural activity and the typical retinotopic alpha suppression when focusing on ongoing rhythms. These opposite but parallel effects suggest that spatial attention may bias the neural processing of dynamic visual stimulation via two complementary neural mechanisms.
Original languageEnglish
Number of pages33
JournalJournal of Neuroscience
Early online date15 Feb 2019
DOIs
Publication statusE-pub ahead of print - 15 Feb 2019

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Alpha Rhythm
Photic Stimulation
Brain
Electroencephalography
Visual Evoked Potentials
Research

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title = "Stimulus-driven brain rhythms within the alpha band: The attentional-modulation conundrum",
abstract = "Two largely independent research lines use rhythmic sensory stimulation to study visual processing. Despite the use of strikingly similar experimental paradigms, they differ crucially in their notion of the stimulus-driven periodic brain responses: One regards them mostly as synchronised (entrained) intrinsic brain rhythms; the other assumes they are predominantly evoked responses (classically termed steady-state responses, or SSRs) that add to the ongoing brain activity. This conceptual difference can produce contradictory predictions about, and interpretations of, experimental outcomes. The effect of spatial attention on brain rhythms in the alpha-band (8 - 13 Hz) is one such instance: alpha-range SSRs have typically been found to increase in power when participants focus their spatial attention on laterally presented stimuli, in line with a gain control of the visual evoked response. In nearly identical experiments, retinotopic decreases in entrained alpha-band power have been reported, in line with the inhibitory function of intrinsic alpha. Here we reconcile these contradictory findings by showing that they result from a small but far-reaching difference between two common approaches to EEG spectral decomposition. In a new analysis of previously published EEG data, recorded during bilateral rhythmic visual stimulation, we find the typical SSR gain effect when emphasising stimulus-locked neural activity and the typical retinotopic alpha suppression when focusing on ongoing rhythms. These opposite but parallel effects suggest that spatial attention may bias the neural processing of dynamic visual stimulation via two complementary neural mechanisms.",
author = "Christian Keitel and Anne Keitel and Christopher Benwell and Christoph Daube and Gregor Thut and Joachim Gross",
note = "Funded by a Wellcome Trust Joint Investigator Grant awarded to GT and JG (#098433/#098434)",
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Stimulus-driven brain rhythms within the alpha band : The attentional-modulation conundrum. / Keitel, Christian (Lead / Corresponding author); Keitel, Anne; Benwell, Christopher; Daube, Christoph; Thut, Gregor; Gross, Joachim.

In: Journal of Neuroscience, 15.02.2019.

Research output: Contribution to journalArticle

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AU - Thut, Gregor

AU - Gross, Joachim

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