Estimating the validity of the guilty knowledge test from simulated experiments: the external validity of mock crime studies |
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Authors: | Carmel David Dayan Eran Naveh Ayelet Raveh Ori Ben-Shakhar Gershon |
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Affiliation: | Department of Psychology, Hebrew University of Jerusalem, Jerusalem, Israel. |
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Abstract: | This experiment was designed to examine the external validity of the standard mock-crime procedure used extensively to evaluate the validity of polygraph tests. The authors manipulated the type of mock-crime procedure (standard vs. a more realistic version) and the time of test (immediate vs. delayed) and examined their effects on the validity of the Guilty Knowledge Test (GKT) and the recall rate of the relevant items. The results indicated that only the type of mock-crime affected the 2 outcome variables. The realistic procedure was associated with a lower recall rate and weaker detection efficiency than the standard procedure. However, these effects were mediated by the type of GKT questions used. Practical implications of these results are discussed. |
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