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| Ionizing Radiation, Nuclear Energy, and Elementary Particles |

This colored positron emission tomography (PET) brain scan is that of a schizophrenic male during hallucination. Brain activity (orange) detected by PET scanning has been superimposed on a blue magnetic resonance image (MRI) of the brain. The patient saw colored heads that spoke to him. Visual (at right) and auditory (upper center) areas of the brain are active, confirming the patient has “seen” and “heard” a hallucination. (D. Silbersweig/SPL/Photo Researchers, Inc.)

Copyright © 2007 John Wiley & Sons, Inc. All rights reserved.