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Combining functional neuroimaging with off-line brain stimulation: modulation of task-related activity in language areas.
- Source :
-
Journal of cognitive neuroscience [J Cogn Neurosci] 2011 Feb; Vol. 23 (2), pp. 349-61. Date of Electronic Publication: 2010 Feb 10. - Publication Year :
- 2011
-
Abstract
- Repetitive TMS (rTMS) provides a noninvasive tool for modulating neural activity in the human brain. In healthy participants, rTMS applied over the language-related areas in the left hemisphere, including the left posterior temporal area of Wernicke (LTMP) and inferior frontal area of Broca, have been shown to affect performance on word recognition tasks. To investigate the neural substrate of these behavioral effects, off-line rTMS was combined with fMRI acquired during the performance of a word recognition task. Twenty right-handed healthy men underwent fMRI scans before and after a session of 10-Hz rTMS applied outside the magnetic resonance scanner. Functional magnetic resonance images were acquired during the performance of a word recognition task that used English or foreign-language words. rTMS was applied over the LTMP in one group of 10 participants (LTMP group), whereas the homologue region in the right hemisphere was stimulated in another group of 10 participants (RTMP group). Changes in task-related fMRI response (English minus foreign languages) and task performances (response time and accuracy) were measured in both groups and compared between pre-rTMS and post-rTMS. Our results showed that rTMS increased task-related fMRI response in the homologue areas contralateral to the stimulated sites. We also found an effect of rTMS on response time for the LTMP group only. These findings provide insights into changes in neural activity in cortical regions connected to the stimulated site and are consistent with a hypothesis raised in a previous review about the role of the homologue areas in the contralateral hemisphere for preserving behavior after neural interference.
- Subjects :
- Acoustic Stimulation methods
Adult
Analysis of Variance
Contingent Negative Variation physiology
Functional Laterality
Humans
Image Processing, Computer-Assisted methods
Magnetic Resonance Imaging methods
Male
Neuropsychological Tests
Oxygen blood
Reaction Time physiology
Regression Analysis
Time Factors
Transcranial Magnetic Stimulation methods
Vocabulary
Young Adult
Brain Mapping
Cerebral Cortex blood supply
Cerebral Cortex physiology
Evoked Potentials, Auditory physiology
Learning
Subjects
Details
- Language :
- English
- ISSN :
- 1530-8898
- Volume :
- 23
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Journal of cognitive neuroscience
- Publication Type :
- Academic Journal
- Accession number :
- 20146606
- Full Text :
- https://doi.org/10.1162/jocn.2010.21449