Dissociated α-band modulations in the dorsal and ventral visual pathways in visuospatial attention and perception

Capilla, A., Schoffelen, J.-M., Paterson, G., Thut, G. and Gross, J. (2014) Dissociated α-band modulations in the dorsal and ventral visual pathways in visuospatial attention and perception. Cerebral Cortex, 24(2), pp. 550-561. (doi: 10.1093/cercor/bhs343)

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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 occipito-parietal 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 ventro-lateral 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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Thut, Professor Gregor and Paterson, Dr Gavin and Gross, Professor Joachim and Capilla, Dr Almudena
Authors: Capilla, A., Schoffelen, J.-M., Paterson, G., Thut, G., and Gross, J.
College/School:College of Medical Veterinary and Life Sciences > Institute of Neuroscience and Psychology
Journal Name:Cerebral Cortex
Publisher:Oxford University Press
ISSN (Online):1460-2199
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
468371Investigating neural communication with multivariate autoregressive modelsJoachim GrossWellcome Trust (WELLCOME)084067/Z/07/ZINP - CENTRE FOR COGNITIVE NEUROIMAGING
536511Neural mechanisms of sensory awarenessJoachim GrossWellcome Trust (WELLCOME)091928/Z/10/ZRI NEUROSCIENCE & PSYCHOLOGY