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In the early 1960s, Nobel Prize winner Dr. Roger Sperry proved that

patients who had their corpus callosum severed to try and control epileptic

seizures could no longer communicate between their hemispheres. The struggle

can be seen quite clearly in the postoperative period whe the patient is asked

to do a simple block design. This is a visual, spacial task that the left-hand

(controlled by the right brain in most of us) can do very well but the right

hand (controlled by the language-oriented left brain) does poorly. The right

hand may even intervene to mix up the design.

Some people with epilepsy can control their seizures by concentrating

activity on the hemisphere that is not affected. In the case of left lobe

epilepsy, this can be done by engaging in a right-brain activity such as drawing.

One intriguing question is why we have two hemispheres at all? “In

biology you always have the same thing on one side as the other – ears, lungs,

eyes, kidneys, etc.” explains Dr. Patricia De Feudis, director of psychology at

Credit Valley Hospital in Mississauga, Ont. “But with the brain there is more

specialization. You can have something going on one side and not not be aware

of it in the other.”

Our knowledge of the brain is general is only beginning. We know even

less about how the hemispheres operate, Getting in touch with how the two sides

work can only do us good, if just to keep us from walking around “half-brained”.

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