Restoring cerebral blood flow reveals neural regions critical for naming.
We identified areas of the brain that are critical for naming pictures of objects, using a new methodology for testing which components of a network of brain regions are essential for that task. We identified areas of hypoperfusion and structural damage with magnetic resonance perfusion- and diffusion-weighted imaging immediately after stroke in 87 individuals with impaired picture naming. These individuals were reimaged after 3-5 d, after a subset of patients underwent intervention to restore normal blood flow, to determine areas of the brain that had reperfused. We identified brain regions in which reperfusion was associated with improvement in picture naming. Restored blood flow to left posterior middle temporal/fusiform gyrus, Broca's area, and/or Wernicke's area accounted for most acute improvement after stroke. Results show that identifying areas of reperfusion that are associated with acute improvement of a function can reveal the brain regions essential for that function.
Hillis
Argye E
AE
Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA. argye@jhmi.edu
Kleinman
Jonathan T
JT
Newhart
Melissa
M
Heidler-Gary
Jennifer
J
Gottesman
Rebecca
R
Barker
Peter B
PB
Aldrich
Eric
E
Llinas
Rafael
R
Wityk
Robert
R
Chaudhry
Priyanka
P
D001039:Aphasia, Broca / Q000209:etiology / Q000503:physiopathology*; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000098:blood supply* / Q000503:physiopathology*; D002560:Cerebrovascular Circulation; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009415:Nerve Net / Q000503:physiopathology*; D020127:Recovery of Function / Q000502:physiology*; D015424:Reperfusion / Q000379:methods; D020521:Stroke / Q000503:physiopathology* / Q000628:therapy; D016896:Treatment Outcome