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Lecture 25

PSY 344 Lecture 25: Detecting Truth and Lies (polygraphs)
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Department
PSY - Psychology
Course
PSY 344
Professor
Davenport
Semester
Spring

Description
Psych 344 4/28/17 Psych and the Law Detecting truth and lies (polygraphs.) A. Detecting truth and lie - Polygraphs- one of most common methods for determine lies - Polygraphs detect lies by detecting reparation, blood pressure, skin response, heart rate, movement...physiological response - Not detecting if telling lie, detecting if physiological changes in body. - What about someone with high blood pressure? Someone who is just a nervous/ anxious individual? - Not a lot of standardization of administering polygraph. This is one of the big problems. B. Administering the polygraph- - First thing done is saying, “if you lie, this machine will know.” - This is a standard instruction. - Used to make person nervous. - Control question test- requires the administer give two types of test - First type- relative questions about the crime - Second type- “control type” about common misdeeds. Ex: “have you ever stolen anything prior to the age of 21?” - Considered control questions in which most people would answer yes to. - Assumes that innocent people will lie to common misdeed questions. They will get nervous, and get a baseline to physiological spike - Looking for what lie looks like. - Point is- innocent person nervous about misdeed questions and not nervous about relevant questions. - Guilty person would be nervous about relevant questions, and not nervous about misdeed questions. - Directed lie test- variation on control question test. - But subject told to lie about control questions. - Based on the assumption that the guilty person thinks the examiner will know what it looks like when they lie. - Guilty knowledge test- goal is not to have person lie to anything - Instead administer is trying to detect what knowledge the person has - Administer asks question and gives multiple choice answers - Watches device and watches device for spikes during multiple choice questions. - Ex: Knife was found by a. bed b. by back door c. by hedge - Done slowly so that administer can mark physiological response. Goal is to see spike when person hears right answer. - Don’t even have to answer question. - Assumes that innocent person hasn’t heard any information about the case. Has to be info that hasn’t been released
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