Dissociated α-band modulations in the dorsal and ventral visual pathways in visuospatial attention and perception
Entity
UAM. Departamento de Psicología Biológica y de la SaludPublisher
Oxford University PressDate
2014-02-01Citation
10.1093/cercor/bhs343
Cerebral Cortex 24.2 (2014): 550-561
ISSN
1047-3211 (print); 1460-2199 (online)DOI
10.1093/cercor/bhs343Funded by
This work was supported by the Wellcome Trust (084067, 091928), the UK’ Economical and Social Research Council (ESRC) and Medical Research Council (MRC), and the Spanish Ministry of Science and Innovation (2008-0168 Postdoctoral Fellowship to A.C.).Project
Gobierno de España. 2008-0168 Postdoctoral Fellowship to Almudena CapillaEditor's Version
http://dx.doi.org/10.1093/cercor/bhs343Subjects
Alpha; Beamforming; Brain oscillations; Magnetoencephalography; Spatial orienting; PsicologíaNote
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Cerebral Cortex following peer review. The version of record Cerebral Cortex 24.2 (2014): 550-561 is available online at: http://cercor.oxfordjournals.org/Rights
© The Author 2012. Published by Oxford University Press. All rights reserved.Abstract
Modulations of occipito-parietal α-band (8–14 Hz) power that are opposite in direction (α-enhancement vs. α-suppression) and origin of generation (ipsilateral vs. contralateral to the locus of attention) are a robust correlate of anticipatory visuospatial attention. Yet, the
neural generators of these α-band modulations, their interdependence across homotopic areas, and their respective contribution to subsequent perception remain unclear. To shed light on these questions, we employed magnetoencephalography, while human volunteers performed a spatially cued detection task. Replicating previous findings, we found α-power enhancement ipsilateral to the attended hemifield and contralateral α-suppression over occipitoparietal sensors. Source localization (beamforming) analysis
showed that α-enhancement and suppression were generated in 2 distinct brain regions, located in the dorsal and ventral visual streams, respectively. Moreover, α-enhancement and suppression showed different dynamics and contribution to perception. In contrast
to the initial and transient dorsal α-enhancement, α-suppression in ventro-lateral occipital cortex was sustained and influenced subsequent target detection. This anticipatory biasing of ventrolateral extrastriate α-activity probably reflects increased receptivity
in the brain region specialized in processing upcoming target features. Our results add to current models on the role of α-oscillations in attention orienting by showing that α-enhancement and suppression can be dissociated in time, space, and perceptual relevance.
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Google Scholar:Capilla, Almudena
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Schoffelen, Jan-Mathijs
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Paterson, Gavin
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Thut, Gregor
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Gross, Joachim
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