Evoked and intrinsic asymmetries during auditory attention: implications for the contralateral and neglect models of functioning.
Cereb Cortex
; 23(3): 560-9, 2013 Mar.
Article
em En
| MEDLINE
| ID: mdl-22371310
ABSTRACT
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.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Atenção
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Córtex Auditivo
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Percepção Auditiva
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Mapeamento Encefálico
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Dominância Cerebral
Limite:
Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Cereb Cortex
Assunto da revista:
CEREBRO
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos