While taking a polygraph test you wear a blood pressure device to measure your fluctuations, respiration is measured by wearing pneumographs around your chest, and finally electrodes are placed on the subject's fingers to measure skin conductivity.
While taking a polygraph test you wear a blood pressure device to measure your fluctuations, respiration is measured by wearing pneumographs around your chest. Finally electrodes are placed on the subject's fingers. This was to measure skin conductivity.