Psychology 2032A/B Chapter Notes - Chapter 4: Functional Magnetic Resonance Imaging, Polygraph, Autonomic Nervous System
21 Feb 2018
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Document Summary
A polygraph is a device for recording an individual"s autonomic nervous system responses. Polygraph disclosure tests are used to uncover information about an offenders past behaviour. There are countermeasures to beat the polygraph test: physical and mental ways, drugs don"t work. Event related brain potentials are a type of brain based response that has been investigated for detecting deceptions. Measure by placing electrodes on the scalp and by recording electrical patterns related to presentation of a stimulus. A new lie detection technique using functional magnetic resonance imaging has been examined: greater activation in the prefrontal cortex and anterior cingulate regions when telling a lie, premature and not used yet, leads to more guilty verdicts. More difficult for people to control aspects of their nonverbal behavior than their verbal behaviour. Verbal characteristics are: speech fillers (ah or umm, speech errors (word or sentence repetition, sentence change, sentence incomplete, slips of tongue, pitch of voice, slow rate of speech, speech pauses.
