"................Other languages, same issue
Most of the brain imaging research on dyslexia so far has been done on English-speaking people, but the problem exists throughout the world.
In some cases, as in Germany, the dyslexia rate is about half the U.S. figure because German letters, unlike English, are always pronounced the same way regardless of what word they are in.
There is even dyslexia in China and Japan, where the written symbols represent whole words, Dr. Eden said, but in those nations, the brain differences between good and poor readers show up in frontal regions that seem to be involved in processing the shapes of the symbols.
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From:
Dyslexia begins when the wires don't meet
The article goes on to describe how certain areas of the brain need to be correctly functioning to allow individuals to read and illustrates that these areas have been shown to be irregular in dyslexics (under brain scans)