A lie detector.
An instrument which records the pulse in several parts of the body at the same time.
An instrument for determining minor physiological changes assumed to occur under the stress of lying (or any other emotion). Variations in respiratory rhythm, pulse rate, blood pressure, and sweating of the hands are among the functions that are monitored. Increased perspiration lessens resistance to passage of electrical current. The test has popular appeal among law enforcement departments, but results obtained are presumptive and not absolute; nevertheless, interpretations of polygraph data have been admitted as evidence in some legal proceedings. The advisability of accepting the results of polygraph tests is controversial.
A device that captures multiple pulse readings at the same time, like the radial and jugular pulses. Some machines create a photographic record, while others use an ink-writing mechanism. This device is sometimes used as a lie detector.