A very thin and very agile person may, by observing his reflection in a rapid sequence of longitudinal strips, obtain a fairly accurate conception of his looks.
It works by measuring changes in the body such as blood pressure, pulse, respiration, and skin conductivity when a person is asked a series of questions.
Recently, researchers performed scans on 182 people with brain lesions — mostly soldiers with shrapnel wounds — and had them perform a battery of mental tasks.