POLYGRAPH

摘要

A method comprising measuring skin conductivity level of a human subject responsive to a series of preliminary questions; measuring skin conductivity level of the human subject in response to a series of control questions; and in case that a sympathetic activation is detected, finding the authenticity of the response to the control question by comparing the recovery time of skin conductivity level for the control question with the basic recovery time. Further, a method comprising measuring heartbeat of a human subject responsive to a series of preliminary questions to which the answer is known, to derive a level of coherence of the heartbeat being a baseline heartbeat coherence level; presenting the human subject with a series of control questions, and finding the authenticity of a response to a relevant question by comparing the heartbeat coherence detected with the baseline heartbeat coherence and the unbalanced heartbeat coherence.