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Developed by Dr. Jeffrey Carmen, a privately practicing psychologist in New York, passive infrared HEG is a marriage of the classic hemoencephalography principles employed by Toomim and a technique known as thermoscopy. PIR uses a sensor similar to the NIR sensor to detect light from a narrow band of the infrared spectrum that corresponds to the amount of heat being generated by an active brain region, as well as the local blood oxygenation level. The heat detected by PIR is proportional to the amount of sugar being burned to maintain the increased metabolic rate necessary to fuel elevated neuronal activity. PIR has a poorer resolution than NIR and this treatment typically focuses on more global increases in cerebral blood flow.