Detecting Concealed Knowledge Using a Novel Attentional Blink Paradigm |
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Authors: | Giorgio Ganis Pooja Patnaik |
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Institution: | (1) Department of Radiology, Harvard Medical School, Boston, MA 02114, USA;(2) Massachusetts General Hospital, Athinoula Martinos Center for Biomedical Imaging, Building 149, 13th St, Charlestown, MA 02129, USA;(3) Department of Psychology, Harvard University, Cambridge, MA 02138, USA |
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Abstract: | Traditional concealed information paradigms rely on the idea that stimuli that are meaningful to a person (critical items)
will draw attentional resources disproportionately, relative to stimuli that are not (irrelevant items), generating detectable
differences on a suitable dependent variable (behavioral, psychophysiological, or neural). Here, we introduce a behavioral
paradigm that could be used to reveal concealed information by exploiting the link between concealed information and attentional
processes more directly. This novel paradigm is based on the attentional blink phenomenon in which detection of a stimulus
reduces detection accuracy rates of subsequent target stimuli within a 200–500 ms time window. We hypothesized that a well-known
face used as a critical item could capture attentional resources automatically, making it harder to detect the occurrence
of a subsequently presented target face. The results confirmed this hypothesis, and showed that concealed knowledge of a famous
face could be detected in 9 out of 12 individuals by looking for a relative dip in target detection accuracy after the presentation
of a critical item. |
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Keywords: | Concealed information test Concealed knowledge test Lie detection Detection of deception Attentional blink Applied psychology Forensics |
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