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.
It has also provided us with the opportunity to spend hours fixing software glitches on our personal computers or filling our heads with useless information from the Internet.
Recently, researchers performed scans on 182 people with brain lesions — mostly soldiers with shrapnel wounds — and had them perform a battery of mental tasks.