Judging guilt and accuracy: highly confident eyewitnesses are discounted when they provide featural justifications

Jurors are heavily swayed by confident eyewitnesses. Are they also influenced by how eyewitnesses justify their level of confidence? Here we document a counter-intuitive effect: when eyewitnesses identified a suspect from a lineup with absolute certainty (‘I am completely confident’) and justified t...

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Bibliographic Details
Main Author: Dodson, Chad S. (Author)
Contributors: Dobolyi, David G.
Format: Electronic Article
Language:English
Published: 2017
In: Psychology, crime & law
Online Access: Volltext (Resolving-System)
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520 |a Jurors are heavily swayed by confident eyewitnesses. Are they also influenced by how eyewitnesses justify their level of confidence? Here we document a counter-intuitive effect: when eyewitnesses identified a suspect from a lineup with absolute certainty (‘I am completely confident’) and justified their confidence by referring to a visible feature of the accused (‘I remember his nose’), participants judged the suspect as less likely to be guilty than when eyewitnesses identified a suspect with absolute certainty but offered an unobservable justification (‘I would never forget him’) or no justification at all. Moreover, people perceive an eyewitness’s identification as nearly 25% less accurate when the eyewitness has provided a featural justification than an unobservable justification or simply no justification. Even when an eyewitness’s level of confidence is clear because s/he has expressed it numerically (e.g. ‘I am 100% certain’) participants perceive eyewitnesses as not credible (i.e. inaccurate) when the eyewitness has provided a featural justification. However, the effect of featural justifications - relative to a confidence statement only - is maximal when there is an accompanying lineup of faces, moderate when there is a single face and minimal when there is no face at all. The results support our Perceived-Diagnosticity account. 
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