1. A polygraph examination apparatus comprising in combination: a polygraph machine including input leads adapted to be connected to the human body so that the specific human body functions of galvanic skin response, blood pressure, respiration, and pulse and their associated output signals can be monitored; and a spectrum analyzer electronically connected in parallel with said polygraph machine such that the output signals of the human body functions being monitored on said polygraph machine are concurrently monitored on said spectrum analyzer.