Task-specific change of unconscious neural priming in the cerebral language network. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2007

Task-specific change of unconscious neural priming in the cerebral language network.

Résumé

We explored the impact of task context on subliminal neural priming using functional magnetic resonance imaging. The repetition of words during semantic categorization produced activation reduction in the left middle temporal gyrus previously associated with semantic-level representation and dorsal premotor cortex. By contrast, reading aloud produced repetition enhancement in the left inferior parietal lobe associated with print-to-sound conversion and ventral premotor cortex. Analyses of effective connectivity revealed that the task set for reading generated reciprocal excitatory connections between the left inferior parietal and superior temporal regions, reflecting the audiovisual integration required for vocalization, whereas categorization did not produce such backward projection to posterior regions. Thus, masked repetition priming involves two distinct components in the task-specific neural streams, one in the parietotemporal cortex for task-specific word processing and the other in the premotor cortex for behavioral response preparation. The top-down influence of task sets further changes the directions of the unconscious priming in the entire cerebral circuitry for reading.

Domaines

Imagerie

Dates et versions

hal-00349648 , version 1 (03-01-2009)

Identifiants

Citer

Kimihiro Nakamura, Stanislas Dehaene, Antoinette Jobert, Denis Le Bihan, Sid Kouider. Task-specific change of unconscious neural priming in the cerebral language network.. Proceedings of the National Academy of Sciences of the United States of America, 2007, 104 (49), pp.19643-8. ⟨10.1073/pnas.0704487104⟩. ⟨hal-00349648⟩
165 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More