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The role of the insula in speech and language processing
Anna Oh1, Emma G Duerden2, Elizabeth W Pang3
1Neurosciences and Mental Health, SickKids Research Institute, Toronto, Canada.
Brain and Language
|July 13, 2014
Summary
The insula plays a key role in speech and language processing, with distinct regions involved in different functions. Neuroimaging reveals specific areas of the insula are crucial for articulatory control and higher-order language tasks.
Area of Science:
- Neuroscience
- Cognitive Science
- Speech and Language Processing
Background:
- Lesion and neuroimaging studies suggest the insula's role in speech production, particularly articulatory control.
- The insula connects to Broca's area and other language centers, potentially aiding cognitive aspects of speech production.
Purpose of the Study:
- To assess the insula's involvement in speech and language processing.
- To differentiate insula activation patterns during various language and speech tasks.
Main Methods:
- Meta-analysis of 42 functional magnetic resonance imaging (fMRI) studies in healthy adults.
- Activation Likelihood Estimation (ALE) method used to compare insula activation.
- Tasks included expressive and receptive language, and speech production and perception.
Main Results:
- Bilateral anterior insulae were activated by both language and speech tasks.
- Speech perception tasks preferentially activated the left dorsal mid-insula.
- Expressive language tasks preferentially activated the left ventral mid-insula.
Conclusions:
- Distinct regions within the mid-insula are differentially involved in speech and language processing.
- The findings highlight the insula's complex role beyond motor control in language functions.
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