SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Brain activity during reading aloud. This is a composite of a 3-D magnetic resonance imaging (MRI) scan of the brain with positron emission tomography (PET) scans overlaid to show active areas (orange). The most active areas are in the left cerebral hemisphere (at right), site of the brain's language centres. This scan shows the brain of a healthy, normal male subject. For a similar scan showing brain activity in a male dyslexic subject, see image M360/260.
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