Abstract:
:Using functional MRI we compared the patterns of activation in an effortful word retrieval task (stem completion) performed both silently and aloud. The silent and overt conditions showed expected differences in activation magnitude in regions such as primary motor cortex. Some regions, such as frontal operculum and dorsolateral frontal cortex, showed similar activation magnitude across conditions. Thalamus was more active on the left in both conditions and showed a symmetric drop in activity in the silent compared with the overt condition. Putamen was also more active in the overt condition and showed a larger decrease in activity on the right than on the left in the silent compared with the overt condition. Thus it appears that silent and overt performance of this task engage the thalamus and putamen in different ways.
journal_name
Brain Cognjournal_title
Brain and cognitionauthors
Rosen HJ,Ojemann JG,Ollinger JM,Petersen SEdoi
10.1006/brcg.1999.1100subject
Has Abstractpub_date
2000-03-01 00:00:00pages
201-17issue
2eissn
0278-2626issn
1090-2147pii
S0278-2626(99)91100-4journal_volume
42pub_type
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