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Executive Oscillatory Regulation and Speech Fluency: A Systematic Review of Network-Level Neurophysiological Evidence in Stuttering and Linguistic Dysfluency
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Brain Mapping Applications in Epilepsy – Across Pediatric and Adult Populations
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Presenter Author:
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Moones Jedari Mehdipour
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Author:
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Moones Jedari Mehdipour - Corresponding - Presenter
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| Affiliation 1:
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Ali Hem'mati
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Abstract
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Original Research
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introduction :
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Speech fluency depends on the precise temporal coordination of distributed neural
networks supporting executive control, linguistic planning, and sensorimotor integration.
While stuttering and related forms of linguistic dysfluency have historically been conceptualized as motor or linguistic disorders, increasing evidence suggests that they reflect network-level dysregulation in oscillatory dynamics, particularly within executive–linguistic circuits. This systematic review synthesizes electrophysiological and neuroimaging evidence examining oscillatory power, connectivity, and timing in individuals who stutter. Following PRISMA-informed guidelines, studies employing EEG, MEG, and combined EEG–fMRI methodologies were reviewed to evaluate the role of beta- and theta-band oscillations in speech fluency. The findings indicate consistent abnormalities in beta stabilization, theta-mediated monitoring, and long-range network synchronization, while also revealing substantial methodological heterogeneity and conceptual gaps. The review highlights critical shortcomings in existing research and outlines directions for future systematic investigation.
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Methods:
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This systematic review was conducted following PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines insofar as applicable to neurophysiological literature lacking standardized outcome measures (Moher et al., 2009). Given substantial methodological heterogeneity, a qualitative synthesis was
performed rather than a meta-analysis.
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Results:
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The findings synthesized in this review converge on a network-level interpretation of stuttering and linguistic dysfluency. Rather than reflecting isolated motor or linguistic impairments, dysfluency appears to arise from insufficient oscillatory regulation across executive–linguistic circuits. Beta-band hypoactivity undermines the stabilization of speech motor plans, while excessive theta engagement reflects compensatory overmonitoring. Disrupted connectivity further compromises temporal coordination, particularly under condition requiring endogenous control.
Crucially, the context sensitivity of these findings, especially the normalization of
oscillatory patterns under externally structured conditions, argues against fixed structural pathology and supports a dynamic regulatory model.
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Conclusion:
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This systematic review demonstrates that stuttering and linguistic dysfluency are best understood as emergent properties of dysregulated executive oscillatory control within distributed speech networks. Beta- and theta-band dynamics play central roles in stabilizing and monitoring speech production. Addressing existing methodological gap will be essential for advancing theoretical clarity and translational relevance.
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| Attachment:
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| Keywords:
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Executive Oscillatory Regulation, Speech Fluency
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| Key message:
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