Brain dominance

Our brains have a left and a right hemisphere. In the 1960's Nobel Prize Winning neurologist Roger Sperry's confirmed that different types of thinking are done by different brain hemispheres. In a normal person the two halves communicate via a thick nerve sheath called the corpus callosum which ensures that they work. But we still tend to label people as "left" (logical) or "right" (imaginative) brained.

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Ned Herrman put these two ideas together developing his four quadrant model. He suggests that within each hemisphere we have the limbic and cerebral element. Thus we have a limbic left and right and a cerebral left and right.