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Updated: May 30, 2026

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals
Published on: May 23, 2017
Neural correlates in the processing of phoneme-level complexity in vowel production
Haeil Park1, Gregory K Iverson, Hae-Jeong Park
1Department of English Language and Literature, Myongji University, Seoul, Republic of Korea.
Neuroimaging reveals that increased articulatory complexity in speech recruits specific brain regions, including the inferior frontal gyrus. This brain activation may serve as a neurobiological measure of speech complexity.
Area of Science:
- Neuroscience
- Linguistics
- Speech Production
Background:
- Articulatory complexity in phonemes is a key aspect of speech production.
- Understanding the neurobiological underpinnings of speech complexity is crucial for speech science.
Purpose of the Study:
- To investigate the neurobiological correlates of articulatory complexity at the phoneme level during overt speech production.
- To determine if brain activation patterns can serve as a measure of articulo-phonological complexity.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to scan young Korean-speaking adults.
- Participants produced bisyllabic pseudowords with manipulated phonological complexity (COMPLEX, MID-COMPLEX, SIMPLE).
Main Results:
- Increased brain activity in the left inferior frontal gyrus (Brodmann Areas 44 and 47), supplementary motor area, and anterior insula was observed with higher complexity.
- Pars orbitalis (BA 47) within Broca's area was significantly activated for MID-COMPLEX vs. SIMPLE sequences.
- Greater complexity correlated with engagement of larger brain areas.
Conclusions:
- Phonological complexity is reflected in neural processing, involving memory retrieval and articulatory rehearsal.
- Brain activation patterns provide a potential neurobiological measure of articulo-phonological complexity, complementing biomechanical analysis.
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