NATIONAL CANCER INSTITUTE / SCIENCE PHOTO LIBRARY NATIONAL CANCER INSTITUTE / SCIENCE PHOTO LIBRARY
Brain activity during speech. Coloured positron emission tomography (PET) scan of a brain taken during speech. The front of the brain is at left. The active regions are in the left cerebral hemisphere, which is associated with language skills. They include the motor region (upper centre), which is involved in speech production, and the auditory region (right), which is activated by the sound of the speakers own voice.
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