The document discusses hemispheric specialization in the brain. It defines hemispheric specialization as the idea that one hemisphere has specialized functions or greater control over a particular function. The left hemisphere specializes in verbal and analytical functions like language processing, reading, writing, and logical reasoning. The right hemisphere specializes in non-verbal functions like spatial thinking, visual thinking, recognizing faces and tunes, appreciating art and music, and fantasy or daydreaming. Both hemispheres are involved in nearly all functions, though there is some specialization. The document then discusses approaches to researching hemispheric specialization like studying people with brain damage or who have undergone split brain operations.