Feb 3, 2007

Neural correlates of verbal feedback processing: an fMRI study employing overt speech

Human Brain Mapping
Ingrid K ChristoffelsNiels O Schiller

Abstract

Speakers use external auditory feedback to monitor their own speech. Feedback distortion has been found to increase activity in the superior temporal areas. Using fMRI, the present study investigates the neural correlates of processing verbal feedback without distortion. In a blocked design, the following conditions were presented: (1) overt picture-naming, (2) overt picture-naming while pink noise was presented to mask external feedback, (3) covert picture-naming, (4) listening to the picture names (previously recorded from participants' own voices), and (5) listening to pink noise. The results show that auditory feedback processing involves a network of different areas related to general performance monitoring and speech-motor control. These include the cingulate cortex and the bilateral insula, supplementary motor area, bilateral motor areas, cerebellum, thalamus and basal ganglia. Our findings suggest that the anterior cingulate cortex, which is often implicated in error-processing and conflict-monitoring, is also engaged in ongoing speech monitoring. Furthermore, in the superior temporal gyrus, we found a reduced response to speaking under normal feedback conditions. This finding is interpreted in the framework of a forwar...Continue Reading

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  • Citations91

References

Mentioned in this Paper

Mesial Premotor Cortex
Visual Perception
Entire Basal Nuclei
Feedback - System Communication
Acoustic Stimulation
Morphologic Artifacts
Optical Image Reconstruction
Area MII of Woolsey
Supplemental Motor Area Proper
Data Interpretation, Statistical

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