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Neural regions essential for distinct cognitive processes underlying picture naming
Jessica DeLeon1, Rebecca F Gottesman, Jonathan T Kleinman
1Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
Brain : a Journal of Neurology
|March 6, 2007
Summary
Brain damage from stroke affects picture naming. Different brain areas are linked to specific naming problems, showing a network supports this complex cognitive task.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurolinguistics
Background:
- Oral and written picture naming involve complex cognitive processes.
- Understanding the neural basis of these processes is crucial for diagnosing and treating language impairments after stroke.
Purpose of the Study:
- To investigate the relationship between specific brain regions affected by ischemic stroke and distinct components of the picture naming process.
- To determine if the distribution of tissue dysfunction predicts the type of naming impairment.
Main Methods:
- Evaluated 116 acute ischemic stroke patients within 24 hours.
- Utilized a battery of oral and written naming and lexical tests.
- Employed magnetic resonance diffusion and perfusion imaging to identify areas of tissue dysfunction, focusing on Brodmann's areas (BA) 22, 44, 45, 21, 37, 38, and 39.
Main Results:
- Discriminant function analysis classified patients based on primary naming impairment (visual, semantics, lexical access, phonological/orthographic word form, motor speech).
- Linear regression showed specific brain regions (left anterior, inferior, posterior temporal cortex, inferior frontal, and inferior parietal cortex) significantly correlated with naming impairments.
- Findings suggest a distributed network supports naming, with distinct components differentially engaged for specific cognitive processes.
Conclusions:
- The degree and location of brain tissue dysfunction after stroke predict specific deficits in oral and written picture naming.
- This study provides evidence for a network model of naming, where different brain regions are critical for distinct cognitive components.
- These findings have implications for understanding language processing and localization of function in the brain.
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