Normal planum temporale asymmetry in dyslexics with a magnocellular pathway deficit
- 1 February 1999
- journal article
- research article
- Published by Wolters Kluwer Health in NeuroReport
- Vol. 10 (3), 607-612
- https://doi.org/10.1097/00001756-199902250-00030
Abstract
DEVELOPMENTAL dyslexia has been associated with both abnormal hemispheric symmetry of the planum temporale (PT) and a deficit in the magnocellular visual pathway. We examined the relationship between these two abnormalities. Using sagittal magnetic resonance images and three methods, we measured the PT in dyslexic subjects with a documented magnocellular deficit and controls. Dyslexic subjects did not deviate from normal leftward PT asymmetry, but both groups became less left-lateralized with methods that excluded sulcul tissue. Results suggest that dyslexic subjects with a magnocellular deficit do not always have abnormal symmetry of the PT. PT symmetry may instead be related to a different subtype of dyslexia. In addition, PT asymmetry in any subject group depends on the measurement method.Keywords
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