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Lie Detector?

  • 09-09-2016 3:22am
    #1
    Fathom
    Moderators, Category Moderators, Science, Health & Environment Moderators Posts: 9,336 CMod ✭✭✭✭


    Polygraphy. Not science based. Measures physiological responses. Blood pressure. Heart rate. Respiration. Galvanic skin response. Invalid. Doesn't measure lies. May measure anxiety. Perhaps psychological manipulation. "Voodoo psychology." Why are polygraphs still used?


Comments

  • #2
    Black Swan
    Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,528 CMod ✭✭✭✭Black Swan


    Fathom wrote: »
    Why are polygraphs still used?
    William Uttal (2006) in Human Factors in the Court Room: Mythology versus Science suggested that courts, lawyers, law enforcement, government agencies, and the public have evidenced their gullibility by generally accepting the results of lie detectors and other mind reading devices. The polygraph apparatus appears to be a scientific measurement instrument, which helps to mislead many in their belief that it works. "Belief" is a key word here when attempting to explain why it's still used today.


  • #3
    Fathom
    Moderators, Category Moderators, Science, Health & Environment Moderators Posts: 9,336 CMod ✭✭✭✭Fathom


    "Lying has long been a part of everyday life. We couldn't get through the day without being deceptive" (Leonard Saxe, polygraph expert Brandeis University). Lying was a condition of life per Nietzche. Lies and Romance? 101 Lies Men Tell Women, by Dory Hollander. In film? True Lies. Ref: https://www.psychologytoday.com/articles/199705/the-truth-about-lying


  • #4
    ScumLord
    Registered Users, Registered Users 2 Posts: 28,789 ✭✭✭✭ScumLord


    One of the funny ways I've heard of giving those tests false readings is to clench your sphincter when you want to register a lie on the machine.


  • #5
    Padre101
    Registered Users, Registered Users 2 Posts: 470 ✭✭Padre101


    In TV drama "The Americans", Burov advised Nina to use the sphincter-clenching method to defeat a polygraph test the CIA wanted her to take. She passed.


  • #6
    Fathom
    Moderators, Category Moderators, Science, Health & Environment Moderators Posts: 9,336 CMod ✭✭✭✭Fathom


    Questionable film plots. Basic Instinct. Lead female character. Did she defeat the lie detector? Russia House. Did lead male character defeat lie detector? Recurrent theme.


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  • #7
    ScumLord
    Registered Users, Registered Users 2 Posts: 28,789 ✭✭✭✭ScumLord


    A TV show "lie to me" took the lie detector to a new level. Now they're watching your micro expressions because someone obviously just heard about micro expressions. If they'd just read past the opening paragraphs they wouldn't look so stupid making all sorts of claims that aren't true. Characters were getting sent down on the whims and say so's of the main character.


  • #8
    Fathom
    Moderators, Category Moderators, Science, Health & Environment Moderators Posts: 9,336 CMod ✭✭✭✭Fathom


    Sean Spence, a professor of general adult psychiatry at the University of Sheffield in England. Used fMRI, not polygraph. Claims tracking blood flow to brain detects lying. Thoughts measured by fMRI? More pseudo-science? Ref: https://www.scientificamerican.com/article/lie-brain-fmri-polygraph/


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