The Effects of Knowledge of Case Evidence on Deception Detection Accuracy
Date
2020-12
Authors
Hunter, Madison
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Madon, Stephanie
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Abstract
I conducted a study that investigated how contextual information and truth expectancy affect participants' ability to detect lies in a 2 (truth status: guilty liar vs. innocent truth teller) x 2 (contextual information: absent vs. present) x 2 (expectancy: lie vs. truth) experiment. As a result, I was able to examine whether participants with different expectancies about the suspects’ truthfulness use contextual information differently to make judgments of deception. I predicted that because individuals with a lie expectancy might be more inclined to search for cues indicative of deception, they will display higher accuracy when contextual information is provided than individuals who have a truth bias. I also predicted that the presence of contextual information will increase the number of truth judgements, as found in prior research conducted in our laboratory. The preliminary results of my statistical analysis suggest that contextual information may not increase accuracy, but instead create a truth bias that is exhibited regardless of whether the individual is led to believe that the suspect is truthful or deceptive.
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