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Activation of right insular cortex during imaginary speech articulation
Yutaka Kato1, Taro Muramatsu, Motoichiro Kato
1Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan.
Neuroreport
|May 15, 2007
Summary
Brain activity prepares for speech articulation, originating in the insular cortices. This study used magnetoencephalography to visualize prearticulatory processes, identifying early magnetic signals linked to motor initiation.
Area of Science:
- Neuroscience
- Speech Science
- Cognitive Science
Background:
- Human speech articulation involves complex brain programming.
- Analyzing speech articulation with neuroimaging is challenging due to time-locked motor noise.
- Prearticulatory automatic processes are crucial for motor initiation in speech.
Purpose of the Study:
- To visualize prearticulatory automatic processes of speech motor initiation.
- To identify brain regions involved in the preparation for vocalization.
- To investigate the temporal dynamics of speech motor control.
Main Methods:
- Magnetoencephalography (MEG) was employed.
- Twelve participants imagined vocalizing a phonogram after a visual cue.
- Magnetic activity related to speech preparation was analyzed.
Main Results:
- Magnetic activity correlating with articulation preparation was observed in the insular cortices.
- This activity occurred approximately 160 ms after the visual cue.
- A relative dominance of this activity was noted in the right hemisphere.
Conclusions:
- Speech motor control appears to originate from the insular regions.
- The 'automatic' nature of the task may explain the observed right-sided hemispheric dominance.
- This study provides insights into the neural basis of speech preparation.
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