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Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping

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Foreign accent syndrome: a multimodal mapping study.

Barbara Tomasino¹, Dario Marin, Marta Maieron

¹IRCCS "E. Medea", San Vito al Tagliamento (PN), Italy. btomasino@ud.lnf.it

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior

|December 2, 2011

Summary

Foreign Accent Syndrome (FAS) involves altered speech rhythm and melody due to brain changes. This study links FAS to the primary motor cortex and feedforward control of speech articulation.

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Area of Science:

Neuroscience
Linguistics
Neurology

Background:

Foreign Accent Syndrome (FAS) is a rare disorder affecting speech production.
Understanding the neuroanatomical basis of FAS is crucial for speech production models.

Observation:

A case study of an Italian native speaker with FAS following a left precentral gyrus tumor.
The patient exhibited altered speech rhythm and melody, perceived as a foreign accent.
No other cognitive deficits, dysarthria, apraxia, or aphasia were present.

Findings:

fMRI revealed increased activation in phonation areas around the pre/postcentral gyrus during speech tasks.
Intraoperative mapping identified distinct speech arrest sites and a nearby mouth motor representation.
The primary motor cortex plays a significant role in FAS.

Implications:

This case suggests FAS may stem from disrupted feedforward control commands in speech articulation.
The findings highlight the importance of the primary motor cortex in speech production.
Further research into the precentral gyrus's role in articulation control is warranted.