Functional reorganization of the auditory pathways following late callosotomy.
Neurocase
; 17(5): 440-6, 2011 Oct.
Article
en En
| MEDLINE
| ID: mdl-21967283
ABSTRACT
Injuries at various levels of the auditory system have been shown to lead to functional reorganization of the auditory pathways. In particular, it has recently been shown that such reorganization can occur in callosal agenesis. The pattern of cortical activity following callosotomy is however still unknown, but behavioral results suggest that it could be significantly different from that observed in callosal agenesis. We aimed to confirm this hypothesis by investigating fMRI responses to complex sounds presented binaurally and monaurally in a callosotomized patient. In the binaural condition, the callosotomized subject showed patterns of auditory cortical activation that were similar to those of neurologically intact individuals. However, in both monaural conditions, the callosotomized individual showed a significant increase of the asymmetries favoring the contralateral pathways. Such patterns of cortical responses are only partially consistent with the results obtained from callosal agenesis subjects using the exact same procedure. Indeed, the latter show differences compared with normals in both binaural and monaural conditions. These findings provide neurological evidence that callosotomy could lead to distinctive functional reorganization of the human auditory pathways.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Corteza Auditiva
/
Vías Auditivas
/
Cuerpo Calloso
Límite:
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Neurocase
Asunto de la revista:
CIENCIAS DO COMPORTAMENTO
/
NEUROLOGIA
/
PSICOLOGIA
/
PSIQUIATRIA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Canadá