A case study of a teenage patient who had the right and left half of his brain disconnected showed that speech centers and motor centers could cooperate or not cooperate in odd ways. Makes you think about how we do things normally, especially the part about mood...how often are the right and left sides of our brain at odds with each other in our daily lives?

"P.S.'s right hemisphere was able to respond to the questions asked of it. The answers and evaluations of this hemisphere, however, sometimes differed from those of the dominant left side. For example, the left hemisphere stated that P.S. wanted to be a draftsman when he grew up, yet his right hemisphere spelled out "automobile race" when asked what job it would pick...

The patient seemed to be in a better mood when the opinions and values of the two hemispheres were similar."

-Consciousness and Behavior, by Wallace and Fisher