Effective connectivity of brain regions related to visual word recognition: An fMRI study of Chinese reading.
Hum Brain Mapp
; 36(7): 2580-91, 2015 Jul.
Article
en En
| MEDLINE
| ID: mdl-25788100
ABSTRACT
Past neuroimaging studies have focused on identifying specialized functional brain systems for processing different components of reading, such as orthography, phonology, and semantics. More recently, a few experiments have been performed to look into the integration and interaction of distributed neural systems for visual word recognition, suggesting that lexical processing in alphabetic languages involves both ventral and dorsal neural pathways originating from the visual cortex. In the present functional magnetic resonance imaging study, we tested the multiple pathways model with Chinese character stimuli and examined how the neural systems interacted in reading Chinese. Using dynamic causal modeling, we demonstrated that visual word recognition in Chinese engages the ventral pathway from the visual cortex to the left ventral occipitotemporal cortex, but not the dorsal pathway from the visual cortex to the left parietal region. The ventral pathway, however, is linked to the superior parietal lobule and the left middle frontal gyrus (MFG) so that a dynamic neural network is formed, with information flowing from the visual cortex to the left ventral occipitotemporal cortex to the parietal lobule and then to the left MFG. The findings suggest that cortical dynamics is constrained by the differences in how visual orthographic symbols in writing systems are linked to spoken language.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Reconocimiento Visual de Modelos
/
Lectura
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Imagen por Resonancia Magnética
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Corteza Cerebral
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Red Nerviosa
Tipo de estudio:
Prognostic_studies
Límite:
Adolescent
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Adult
/
Female
/
Humans
/
Male
País/Región como asunto:
Asia
Idioma:
En
Revista:
Hum Brain Mapp
Asunto de la revista:
CEREBRO
Año:
2015
Tipo del documento:
Article
País de afiliación:
China