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Cerebral Cortex Advance Access originally published online on August 23, 2007
Cerebral Cortex 2008 18(5):1139-1147; doi:10.1093/cercor/bhm145
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

A Frontoparietal Network for Spatial Attention Reorienting in the Auditory Domain: A Human fMRI/MEG Study of Functional and Temporal Dynamics

M. Brunetti1,2, S. Della Penna1,2, A. Ferretti1,2, C. Del Gratta1,2, F. Cianflone1,2, P. Belardinelli1,2,3, M. Caulo1,2, V. Pizzella1,2, M. Olivetti Belardinelli3,4 and G. L. Romani1,2

1 Institute of Advanced Biomedical Technologies, 2 Department of Clinical Sciences and Biomedical Imaging, University "G. D'Annunzio"of Chieti, Via dei Vestini, 33, 66013 Chieti (CH), Italy, 3 ECONA (Interuniversity Centre for Research on Cognitive Processing in Natural and Artificial Systems), 4 Department of Psychology, University of Rome "La Sapienza", via dei Marsi, 78, 00185 Rome (RM), Italy

Address correspondence to Marcella Brunetti. Email: mbrunetti{at}itab.unich.it.

Several studies have identified a supramodal network critical to the reorienting of attention toward stimuli at novel locations and which involves the right temporoparietal junction and the inferior frontal areas. The present functional magnetic resonance imaging (fMRI)\magnetoencephalography (MEG) study investigates: 1) the cerebral circuit underlying attentional reorienting to spatially varying sound locations; 2) the circuit related to the regular change of sound location in the same hemifield, the change of sound location across hemifields, or sounds presented randomly at different locations on the azimuth plane; 3) functional temporal dynamics of the observed cortical areas exploiting the complementary characteristics of the fMRI and MEG paradigms. fMRI results suggest 3 distinct roles: the supratemporal plane appears modulated by variations of sound location; the inferior parietal lobule is modulated by the cross-meridian effect; and the inferior frontal cortex is engaged by the inhibition of a motor response. MEG data help to elucidate the temporal dynamics of this network by providing high-resolution time series with which to measure latency of neural activation manipulated by the reorienting of attention.

Key Words: auditory processing • fMRI • MEG • reorienting response • vertical meridian


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