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Spontaneous EEG oscillations reveal periodic sampling of visual attention

Busch, Niko A. ; Vanrullen, Rufin

Proceedings of the National Academy of Sciences of the United States of America, 14 September 2010, Vol.107(37), pp.16048-16053 [Peer Reviewed Journal]

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Title:
Spontaneous EEG oscillations reveal periodic sampling of visual attention
Author/Creator: Busch, Niko A. ; Vanrullen, Rufin
Language: English
Subjects: Health sciences -- Health care industry -- Health information ; Applied sciences -- Engineering -- Electrical engineering ; Behavioral sciences -- Psychology -- Cognitive psychology ; Behavioral sciences -- Psychology -- Cognitive psychology ; Physical sciences -- Physics -- Mechanics ; Biological sciences -- Biology -- Neuroscience ; Physical sciences -- Physics -- Fundamental forces ; Behavioral sciences -- Psychology -- Experimental psychology ; Arts -- Applied arts -- Architecture ; Mathematics -- Pure mathematics -- Linear algebra
Is Part Of: Proceedings of the National Academy of Sciences of the United States of America, 14 September 2010, Vol.107(37), pp.16048-16053
Description: An important effect of sustained attention is the facilitation of perception. Although the term "sustained" suggests that this beneficial effect endures continuously as long as something is attended, we present electrophysiological evidence that perception at attended locations is actually modulated periodically. Subjects detected brief light flashes that were presented peripherally at locations that were either attended or unattended. We analyzed the correlation between detection performance for attended and unattended stimuli and the phase of ongoing EEG oscillations, which relate to subsecond fluctuations of neuronal excitability. Although on average, detection performance was improved by attention—indicated by reduced detection thresholds at attended locations—we found that detection performance for attended stimuli actually fluctuated over time along with the phase of spontaneous oscillations in the θ (≈ 7 Hz) frequency band just before stimulus onset. This fluctuation was absent for unattended stimuli. This pattern of results suggests that "sustained" attention in fact exerts its facilitative effect on perception in a periodic fashion.
Identifier: ISSN: 00278424

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