open access

Vol 51, No 6 (2017)
Case reports
Submitted: 2017-01-30
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Pure apraxia of speech due to infarct in premotor cortex

Riddhi Patira, Lauren Ciniglia, Timothy Calvert, Eric L. Altschuler
DOI: 10.1016/j.pjnns.2017.08.006
·
Neurol Neurochir Pol 2017;51(6):519-524.

open access

Vol 51, No 6 (2017)
Case reports
Submitted: 2017-01-30

Abstract

Apraxia of speech (AOS) is now recognized as an articulation disorder distinct from dysarthria and aphasia. Various lesions have been associated with AOS in studies that are limited in precise localization due to variability in size and type of pathology. We present a case of pure AOS in setting of an acute stroke to localize more precisely than ever before the brain area responsible for AOS, dorsal premotor cortex (dPMC). The dPMC is in unique position to plan and coordinate speech production by virtue of its connection with nearby motor cortex harboring corticobulbar tract, supplementary motor area, inferior frontal operculum, and temporo-parietal area via the dorsal stream of dual-stream model of speech processing. The role of dPMC is further supported as part of dorsal stream in the dual-stream model of speech processing as well as controller in the hierarchical state feedback control model.

Abstract

Apraxia of speech (AOS) is now recognized as an articulation disorder distinct from dysarthria and aphasia. Various lesions have been associated with AOS in studies that are limited in precise localization due to variability in size and type of pathology. We present a case of pure AOS in setting of an acute stroke to localize more precisely than ever before the brain area responsible for AOS, dorsal premotor cortex (dPMC). The dPMC is in unique position to plan and coordinate speech production by virtue of its connection with nearby motor cortex harboring corticobulbar tract, supplementary motor area, inferior frontal operculum, and temporo-parietal area via the dorsal stream of dual-stream model of speech processing. The role of dPMC is further supported as part of dorsal stream in the dual-stream model of speech processing as well as controller in the hierarchical state feedback control model.

Get Citation

Keywords

Apraxia of speech, Stroke, Insula, Premotor cortex, Dorsal stream

About this article
Title

Pure apraxia of speech due to infarct in premotor cortex

Journal

Neurologia i Neurochirurgia Polska

Issue

Vol 51, No 6 (2017)

Pages

519-524

DOI

10.1016/j.pjnns.2017.08.006

Bibliographic record

Neurol Neurochir Pol 2017;51(6):519-524.

Keywords

Apraxia of speech
Stroke
Insula
Premotor cortex
Dorsal stream

Authors

Riddhi Patira
Lauren Ciniglia
Timothy Calvert
Eric L. Altschuler

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