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Specialization in the Left and Right Hemispheres The red arrow at the top of each PET scan points to the front of the brain. The red and yellow colors indicate the areas of greatest brain activity. Listening to speech involves a greater degree of activation of the language areas of the left hemisphere. Listening to music involves more activation in right-hemisphere areas. Notice, however, that there is some degree of activity in both hemispheres during these tasks.
Dr. John Mazziotta et al./Science Source