Abstract：
:The visual perception of words is known to activate the auditory representation of their spoken forms automatically. We examined the neural mechanism for this phonological activation using transcranial magnetic stimulation (TMS) with a masked priming paradigm. The stimulation sites (left superior temporal gyrus [L-STG] and inferior parietal lobe [L-IPL]), modality of targets (visual and auditory), and task (pronunciation and lexical decision) were manipulated independently. For both within- and cross-modal conditions, the repetition priming during pronunciation was eliminated when TMS was applied to the L-IPL, but not when applied to the L-STG, whereas the priming during lexical decision was eliminated when the L-STG, but not the L-IPL, was stimulated. The observed double dissociation suggests that the conscious task instruction modulates the stimulus-driven activation of the lateral temporal cortex for lexico-phonological activation and the inferior parietal cortex for spoken word production, and thereby engages a different neural network for generating the appropriate behavioral response.
journal_name
Neuronjournal_title
Neuronauthors
Nakamura K,Hara N,Kouider S,Takayama Y,Hanajima R,Sakai K,Ugawa Ydoi
10.1016/j.neuron.2006.09.030subject
Has Abstractpub_date
2006-11-09 00:00:00pages
557-64issue
3eissn
0896-6273issn
1097-4199pii
S0896-6273(06)00737-9journal_volume
52pub_type
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