In most people, the brain’s functions are organized asymmetrically: The left hemisphere is dominant for language-related functions, such as speaking and understanding spoken words, whereas the right hemisphere is dominant for nonverbal skills, such as reading maps, solving jigsaw puzzles, listening to music, or performing motor skills. This is called normal asymmetrical brain function, because each hemisphere of the brain appears to play a more important role in a particular aspect of cognitive functioning than does the other hemisphere.
