Nonverbal oral apraxia in primary progressive aphasia and apraxia of speech

Hugo Botha, Joseph R. Duffy, Edythe A. Strand, Mary Margaret Machulda, Jennifer Lynn Whitwell, Keith Anthony Josephs

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Objective: The goal of this study was to explore the prevalence of nonverbal oral apraxia (NVOA), its association with other forms of apraxia, and associated imaging findings in patients with primary progressive aphasia (PPA) and progressive apraxia of speech (PAOS). Methods: Patients with a degenerative speech or language disorder were prospectively recruited and diagnosed with a subtype of PPA or with PAOS. All patients had comprehensive speech and language examinations. Voxel-based morphometry was performed to determine whether atrophy of a specific region correlated with the presence of NVOA. Results: Eighty-nine patients were identified, of which 34 had PAOS, 9 had agrammatic PPA, 41 had logopenic aphasia, and 5 had semantic dementia. NVOA was very common among patientswith PAOS but was found in patients with PPA as well. Several patients exhibited only one of NVOA or apraxia of speech. Among patientswith apraxia of speech, the severity of the apraxia of speechwas predictive of NVOA, whereas ideomotor apraxia severity was predictive of the presence of NVOA in those without apraxia of speech. Bilateral atrophy of the prefrontal cortex anterior to the premotor area and supplementary motor area was associated with NVOA. Conclusions: Apraxia of speech, NVOA, and ideomotor apraxia are at least partially separable disorders. The association of NVOA and apraxia of speech likely results from the proximity of the area reported here and the premotor area, which has been implicated in apraxia of speech. The association of ideomotor apraxia and NVOA among patients without apraxia of speech could represent disruption of modules shared by nonverbal oral movements and limb movements.

Original languageEnglish (US)
Pages (from-to)1729-1735
Number of pages7
JournalNeurology
Volume82
Issue number19
DOIs
StatePublished - May 13 2014

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Primary Progressive Aphasia
Apraxias
Ideomotor Apraxia
Apraxia of Speech
Apraxia
Motor Cortex
Atrophy

ASJC Scopus subject areas

  • Clinical Neurology
  • Arts and Humanities (miscellaneous)

Cite this

Nonverbal oral apraxia in primary progressive aphasia and apraxia of speech. / Botha, Hugo; Duffy, Joseph R.; Strand, Edythe A.; Machulda, Mary Margaret; Whitwell, Jennifer Lynn; Josephs, Keith Anthony.

In: Neurology, Vol. 82, No. 19, 13.05.2014, p. 1729-1735.

Research output: Contribution to journalArticle

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