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Psychology Terms >> Guilty Knowledge Test (GKT)
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Guilty Knowledge Test (GKT)
Guilty Knowledge Test is a type of test sometimes used in criminal investigations. The GKT assumes that a person who is guilty of committing a crime will show some involuntary physiological response to stimuli related to remembered details ofthe crime.
The GKT is conceptually and procedurally different from a 'lie detection test', in which the task is to define a set ofphysiologic responses which accompany 'lying' and 'telling the truth'. Rather, in the Guilty Knowledge Test, 'guilt' implies having knowledge about some specific crime-related details that would be unknown to persons not involved in the crime. Since only the actual perpetrator of the crime possesses 'guilty knowledge', s/he is expected to respond physiologically to crime-related details to a greater and more consistent degree than an innocent person would.
During the GKT, the suspect is verbally presented at a slow pace with a series of multiple-choice questions, each containing five alternative answers from which he must select one, even if s/he is purely guessing. One of the alternatives is a detail about the crime that only the actual criminal would know, and the other four are distractors.
As a result, even though the culprit may not consciously recognize the critical item, s/he may manifest unconscious recognition at a physiological level.
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