I looked at those links JayDee posted below, namely

http://lesswrong.com/lw/8i1/drawing_less_wrong_observing_reality/

and this is what was said about Edwards' book:

Later on, neuroscientists learned that while the two processing centers are real, they are not neatly divided between brain hemispheres. The modern edition of the book uses the terms "left mode" and "right mode" to distinguish between the modes of though

Since she recognized this, it seems my critique about the hemisphere stuff is not meaningful anymore.