Patent ID: 7967750

Claim:
A method for evaluating the truthfulness of a subject's response to questions posed during administration of a polygraph examination thereto, comprising: connecting the subject to a polygraph instrument comprising: channels for measurement of heart rate variability via electrocardiography and gastric electric rhythm via gastroelectrography; and a processing unit operatively connected thereto; said processing unit configured to record and compare the measurements; posing a plurality of control questions to the subject; posing a plurality of relevant questions to the subject; measuring heart rate variability and gastric electric rhythm in the subject after posing the controlling questions to obtain a baseline for each of said heart rate variability and gastric electric rhythm; measuring heart rate variability and gastric electric rhythm in the subject after posing the relevant questions; and comparing the heart rate variability and gastric electric rhythm after posing said relevant questions with the heart rate variability baseline and the gastric electric rhythm baseline, wherein an occurrence of bradygastria during posing of said relevant questions compared to the corresponding baseline is indicative that the response to the relevant questions is truthful even if heart rate variability increases compared to its corresponding baseline during posing of said relevant questions.