1. Dyslexic Example Control Example Center) Left Left Anterior Anterior
Functional MR spectroscopic images during a phonological task. The red boxes show areas of brain activation as measured by brain lactate changes. The image on the left is from a dyslexic subject. The image on the right is from a "normal" volunteer. The subject's left side is on the image right side (radiological convention). Notice the dyslexic subject has large activation in the left anterior region of the brain. This kind of difference is specific to the phonological task. (Data from the University of Washington Learning Disability
Center)

2. The next two slides show brain imaging differences between
dyslexics and controls during a lexical access task using
functional MR imaging. The red boxes show areas of brain
activation as measured by blood oxygenation. Notice that all
of the 6 normal subjects have activation in the insula (upper
oval) and in the temporal lobe (lower oval). None of the
dyslexic subjects had activation in the insula and they had
inconsistent activation in the temporal lobe.
(Data from the University of Washington Learning Disability
Center)

3. Control - Lexical Access task

4. Dyslexics - Lexical Access Task