Evoked and intrinsic asymmetries during auditory attention: implications for the contralateral and neglect models of functioning

Unlike the visual system, a direct mapping of extrapersonal space does not exist within human auditory cortex (AC). Thus, models (contralateral bias vs. neglect) of how auditory spatial attention is allocated remain debated, as does the role of hemispheric asymmetries. To further examine these quest...

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Published in:Cerebral cortex (New York, N.Y. 1991) N.Y. 1991), 2013-03, Vol.23 (3), p.560-569
Main Authors: Teshiba, Terri M, Ling, Josef, Ruhl, David A, Bedrick, Bronwyn S, Peña, Amanda, Mayer, Andrew R
Format: Article
Language:English
Subjects:
Adult
Attention - physiology
Auditory Cortex - physiology
Auditory Pathways - physiology
Auditory Perception - physiology
Brain Mapping
Dominance, Cerebral - physiology
Female
Humans
Image Interpretation, Computer-Assisted
Magnetic Resonance Imaging
Male
Models, Neurological
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Summary:Unlike the visual system, a direct mapping of extrapersonal space does not exist within human auditory cortex (AC). Thus, models (contralateral bias vs. neglect) of how auditory spatial attention is allocated remain debated, as does the role of hemispheric asymmetries. To further examine these questions, 27 participants completed an exogenous auditory orienting task while undergoing functional magnetic resonance imaging. Resting-state data were also collected to characterize intrinsic activity within the AC. Current results provide the first evidence of hemispheric specialization in the "where" (right secondary AC) auditory processing stream during both evoked (orienting task) and intrinsic (resting-state data) activity, suggesting that spontaneous and evoked activity may be synchronized by similar cortical hierarchies. Strong evidence for a contralateral bias model was observed during rapid deployment stages (facilitation) of auditory attention in bilateral AC. However, contralateral bias increased for left and decreased for right AC (neglect model) after longer stimulus onset asynchronies (inhibition of return), suggesting a role for higher-order cortical structures in modulating AC functioning. Prime candidates for attentional modulation include the frontoparietal network, which demonstrated right hemisphere lateralization across multiple attentional states.
ISSN:1047-3211
1460-2199
DOI:10.1093/cercor/bhs039