Textbook Notes (367,754)
Canada (161,370)
Psychology (3,330)
PSYC 3020 (97)
Dan Yarmey (94)
Chapter 4

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PSYC 3020
Dan Yarmey

CHAPTER 4 THE POLYGRAPH TECHNIQUEUnderlying principle of polygraph deception is associated with physiological change The origins of modern polygraph date from 1917 when William Marston developed a systolic blood pressure test and attempted to use this physiological response as evidence for a persons innocencePolygraph A device for recording an individuals autonomic nervous systemMeasurement devices are attached to upper chest and abdomen to measure breathing The amount of sweat on the skin is measured by attaching electrodes to the fingertips Sweat changes the conductance of the skin which is known as the galvanic skin response Finally heart rate is measured by a partially inflated blood pressure cuff attached to an arm Each of these measures is amplified and can be printed out on paper or stored in a computer to be analyzed Polygraph is used to measure a persons physiological responses to questions asked by an examinerApplications of the Polygraph TestIn Canada the police often use them to help in their criminal investigationsAlthough not common police may ask alleged victims of crimes to take a polygraph test to help to verify whether a crime has occurredPolygraph disclosure test Polygraph tests that are used to uncover information about an offenders past behaviourPolygraph tests are used to determine whether the offender is violating the conditions of probation or are used to test for evidence of risky behaviour such as sexual fantasies about childrenIn United States polygraph testing was done on employees to identify those who engaged in theft or those using drugs at work For the selection process it was also used to weed out those with criminal tendencies and substance abuse problemsTypes of Polygraph TestsThe two main types of polygraph tests are reviewed below o The comparison question testComparison Question Test CQT Type of polygraph test that includes irrelevant questions that are unrelated to the crime relevant questions concerning the crime being investigated and comparison questions concerning the persons honesty and past history prior to the event being investigatedA critical component of this technique is the pretest interviewThere are three possible outcomes of a polygraph test truthful deceptive and inconclusive o The Concealed Information Test
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