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Chapter 4

Chapter 4 Detailed Notes

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David Nussbaum

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Chapter 4 Deception Physiological measures have been used in an attempt to detect deception. For example the Chinese forced suspects to chew on dry rice powder and then spit it out. It was said that a person telling the truth would not be anxious and therefore would not have a dry mouth, and vice versa. Deception is associated with psychological change The origins of the modern polgraphy date from 1917 when William Marston developed a systolic blood pressure test and attempted to use it this psychological response as evidence for a persons innocence Polygraph is composed of two words poly which means many and grapho which means write A polygraph is a device that measures an individuals ANS response; measurement devices are attached to the upper chest and abdomen to measure breathing, amount of sweat on skin measured by electrodes attached to fingertips (Galvanic skin response), and heart rate is measure by two inflated blood pressure cuffs attached to an arm. In Canada, polygraphs are often used by the police to help in their criminal investigations. Police may ask suspect to take a test, or even the victims to consider if crime has actually occurred. Polygraph disclosure test is a test that is used to uncover information about an offenders past behaviour (violating conditions of probation, etc) Polygraph does not detect lies per se, instead it measures physiological responses to different types of questions. Some questions are designed to elicit a larger physiological response in guilty individuals than in those who are innocent. There are 3 main types of polygraph tests: RelevantIrrelevant Test, Control Question Test (CQT), and Guilty Knowledge Test (GKT) 1. The RelevantIrrelevant Test was first developed in 1917 by William Marston and later refined by John Larson for use in criminal investigations. It includes two types of questions relevant questions concerning the crime, and irrelevant questions that are unrelated to the crime www.notesolution.com
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