Hello1977 wrote on Sep 1
st, 2016 at 1:47am:
George, thank you very much for your response. I have a few lingering questions, though.
I read the link you provided as well as the entire lie behind the lie detector. Forgive my ignorance but I don't seem to understand what change from baseline they measure on your heart rate, if not increased bpm. What else besides BPM and blood pressure does the machine catalog?
The cardio channel reflects changes in blood pressure and heart rate. The baseline (that is, the vertical position of the cardio waveform on the chart) rises or falls with changes in blood pressure.
Quote:What physiological changes are you trying to accomplish during the control questions, in regards to heart beat? What does doing mental arithmetic do to your circulatory system responses?
The cardio channel (unlike the respiratory channel) cannot be directly manipulated. However, mental such as rapidly performing mental arithmetic or physical countermeasures such as tongue-biting may result in timely changes in blood pressure and heart rate.
Quote:Sorry if these are stupid questions, I apologize. I guess the way those polygraph examiner books are written is geared more towards dumbass tarrot card readers with a reading level of a 8th grader. Is my strategy of when I get a control question, exhale and do not inhale for 3-4 seconds, then answer yes or no, a solid strategy? Anything you would add or tweak in regards to my breathing countermeasure plan?
Yes. It's a solid strategy. I believe that DIA polygraph chief Brett A. Stern in fact specifically mentioned this in a presentation a few years back.
Quote:Secondly, I now understand you must give the "expected" answer on control questions. But, I'm confused, so the examiner is cool with you lying on control questions but not relevant?
Correct.
Quote:Seems pretty hypocritical and defeats the "purpose" of the test; i.e. finding out if the examinee is truthful and will answer the testers questions honestly. If someone is lying on the control questions regarding if you have ever stolen something before, why would the examiner believe anything you say from that point on? I guess it doesn't matter, and I understand I must play the game, but it just seems pretty counter-intuitive. Forgive my rambling.
Remember that polygraphy is the brainchild of interrogators, not scientists. The main polygraph method in use today was devised by
a crackpot who was persuaded that plants can read human minds.