Detects bodily changes sometimes associated with lying.
Instrument that records graphically certain body activities, such as thoracic and abdominal respiration, blood pressure, pulse rate, and galvanic skin response (changes in electrical resistance of the skin). Marked changes in these activities when a person answers a question may indicate that the person is lying.
A polygraph for detecting physiological evidence (as change in heart rate) of the tension that accompanies lying.