Comparison of brain activation during word retrieval done silently and aloud using fMRI

Howard J. Rosen, Jeffrey G. Ojemann, John M. Ollinger, Steve E. Petersen

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

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. (C) 2000 Academic Press.

Original languageEnglish
Article number91100
Pages (from-to)201-217
Number of pages17
JournalBrain and Cognition
Volume42
Issue number2
DOIs
StatePublished - 2000

Keywords

  • Language
  • Putamen
  • Stem completion
  • Thalamus
  • fMRI

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