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Differences in functional MR imaging activation patterns associated with confrontation naming and responsive naming.
Sarah Tomaszewki Farias1, Gregory Harrington, Catherine Broomand
1Department of Neurology, University of California, Davis, Sacramento, CA 95817, USA.
AJNR. American Journal of Neuroradiology
|November 16, 2005
Summary
Responsive naming activates more of the temporal lobe, including anterior regions, than confrontation naming. This functional magnetic resonance imaging (fMRI) finding may help predict language changes after temporal lobectomy.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neurolinguistics
Background:
- Direct cortical stimulation indicates responsive naming is more widespread in the temporal lobe than confrontation naming.
- Responsive naming involves anterior temporal regions often resected during temporal lobectomy.
Purpose of the Study:
- To demonstrate the anatomical dissociation between confrontation and responsive naming using functional magnetic resonance imaging (fMRI).
Main Methods:
- Twenty participants completed fMRI scans while performing either a confrontation or responsive naming task.
- Regions of interest were defined within the anterior and posterior temporal lobes.
Main Results:
- Responsive naming showed greater temporal lobe activation than confrontation naming, extending to the temporal pole.
- Responsive naming activated superior, middle, and inferior temporal gyri, while confrontation naming was limited to the middle temporal gyrus.
- Responsive naming activated anterior temporal regions in 90% of participants, compared to 60% for confrontation naming.
Conclusions:
- Findings align with cortical stimulation studies, showing broader temporal lobe activation for responsive naming.
- Responsive naming more frequently engages anterior temporal regions, suggesting its utility in fMRI for pre-surgical language assessment.
- This fMRI paradigm may aid in predicting post-surgical language deficits.