title: The neuroanatomy of pure apraxia of speech in stroke.
abstract: The left insula or Broca's area have been proposed as the neuroanatomical correlate for apraxia of speech (AOS) based on studies of patients with both AOS and aphasia due to stroke. Studies of neurodegenerative AOS suggest the premotor area and the supplementary motor areas as the anatomical correlates. The study objective was to determine the common infarction area in patients with pure AOS due to stroke. Patients with AOS and no or equivocal aphasia due to ischemic stroke were identified through a pre-existing database. Seven subjects were identified. Five had pure AOS, and two had equivocal aphasia. MRI lesion analysis revealed maximal overlap spanning the left premotor and motor cortices. While both neurodegenerative AOS and stroke induced pure AOS involve the premotor cortex, further studies are needed to establish whether stroke-induced AOS and neurodegenerative AOS share a common anatomic substrate.
authors.affiliation: Department of Neurology, Mayo Clinic, Rochester, MN, USA.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Graff-Radford
authors.affiliation: Department of Neurology, Mayo Clinic, Rochester, MN, USA.
authors.forename: David T
authors.initials: DT
authors.lastname: Jones
authors.affiliation: Departments of Neurology, Speech Pathology, Mayo Clinic, Rochester, MN, USA.
authors.forename: Edythe A
authors.initials: EA
authors.lastname: Strand
authors.affiliation: Department of Neurology, Mayo Clinic, Rochester, MN, USA; Departments of Neurology, Movement Disorders, Mayo Clinic, Rochester, MN, USA; Departments of Neurology, Speech Pathology, Mayo Clinic, Rochester, MN, USA.
authors.forename: Alejandro A
authors.initials: AA
authors.lastname: Rabinstein
authors.affiliation: Departments of Neurology, Speech Pathology, Mayo Clinic, Rochester, MN, USA.
authors.forename: Joseph R
authors.initials: JR
authors.lastname: Duffy
authors.affiliation: Department of Neurology, Mayo Clinic, Rochester, MN, USA; Departments of Neurology, Movement Disorders, Mayo Clinic, Rochester, MN, USA. Electronic address: Josephs.keith@mayo.edu.
authors.forename: Keith A
authors.initials: KA
authors.lastname: Josephs
mesh_terms: D000368:Aged; D001037:Aphasia / Q000473:pathology*; D001072:Apraxias / Q000473:pathology*; D005260:Female; D005625:Frontal Lobe / Q000473:pathology*; D006801:Humans; D007802:Language; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000473:pathology; D017397:Prefrontal Cortex / Q000473:pathology; D013060:Speech; D020521:Stroke / Q000473:pathology*
keywords: Aphemia; Apraxia of speech; Premotor cortex; Stroke