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| Description: The top row shows three horizontal scans from a person at rest. The bottom row shows three scans from the same person while he was clenching and unclenching his right fist. The scans show increased uptake of radioactive 2-deoxyglucose in regions of the brain that are devoted to the control of movement, which indicates increased metabolic rate in these areas. Different computer-generated colors indicate different rates of uptake of 2-DG, as shown in the scale at the bottom. (Courtesy of the Brookhaven National Laboratory and the State University of New York, Stony Brook.)
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