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Thalamic-induced stuttering (surgical observations).

O J Andy¹, S C Bhatnagar

¹Department of Neurosurgery, University of Mississippi Medical Center.

Journal of Speech and Hearing Research

|August 1, 1991

Summary

Mechanical perturbation of the thalamus caused speech dysfluencies in a patient. This suggests a speech-regulating feedback circuit involving the thalamus may be disrupted, impacting speech fluency.

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Area of Science:

Neuroscience
Neurology
Speech Science

Background:

Investigating the role of the thalamus in speech production.
Exploring the effects of direct brain perturbation on vocalization.
Understanding the neural basis of speech fluency and dysfluency.

Observation:

Mechanical perturbation of the posteroventromedial thalamus in a patient seeking pain management.
Electrode advancement of 2 mm (1 mm diameter) elicited repetitive speech dysfluencies.
Thalamogram revealed electropathologic discharges at the perturbation site.

Findings:

Speech dysfluencies were induced by mechanical thalamic perturbation.
Electrophysiologic disturbance in the mesothalamic component of a corticomesothalamic feedback circuit is suggested.
Contrasts with previous findings where stimulation at the same site alleviated stuttering.

Implications:

Highlights the thalamus's critical role in speech regulation.
Suggests a potential link between thalamic electrophysiology and speech fluency.
Informs neurosurgical interventions for both pain and speech disorders.

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