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A revolutionary nuclear-medicine medical brain-imaging technique that can be used to map brain activity over time. It is based on the assumption that areas of high radioactivity are associated with brain activity. The level of activity in a given region of a brain can be measured by the amount of glucose it burns. A small amount of radioactive glucose is injected into the brain, and the scanner measures the amount of it that is consumed by different regions. Images of this are then reconstructed by computer analyses that produce a colored picture. Using the PET scan, psychologists have found that it may be possible to distinguish between different psychological disorders by measuring brain activity. Researchers have also found that different areas are activated when one ...

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