WELLCOME DEPT. OF COGNITIVE NEUROLOGY / SCIENCE PHOTO LIBRARY WELLCOME DEPT. OF COGNITIVE NEUROLOGY / SCIENCE PHOTO LIBRARY
Left/right handedness & language in brain. Colour Positron Emission Tomography (PET) scan of areas of the brain active in word recognition. The subjects are thinking of verbs related to heard nouns. A right-handed subject's brain is at top; left-handed at bottom. The left-side of the brain is at left; right-side at right. Brain activity is coloured red/yellow. In a right-handed subject (top) the left-side of the brain is active largely in the frontal region, including the temporal and parietal areas. In a left-handed subject (bottom), the right-side of the brain is activated in those same areas. PET scanning detects blood flow.
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