title: Extracting critical information from group members' partial knowledge using the Searching Concealed Information Test.
abstract: The Concealed Information Test (CIT) is a psychophysiological method designed to detect information that an individual cannot or does not wish to reveal. The present study used a version of the CIT, the Searching Concealed Information Test (SCIT), to extract information from partial information that participants possessed on a planned jailbreak. In the first experiment, 52 undergraduate students were randomly, but not equally, allocated into 15 different clusters of partial knowledge. In each, participants possessed knowledge about 2 of 6 critical items. Using a lenient decision rule, and a combined measure defined as the mean of 3 individual measures (skin conductance response amplitude, finger pulse, and respiration line length) 5 of the 6 critical items were identified. Experiment 2 extended the first experiment to unequal proportions of critical knowledge. Forty-six undergraduate students were randomly allocated into 25 clusters of partial knowledge in which 0, 1, 2, 3, or 6 pieces of information were known. Using the same lenient decision rule and the combined measure, all 6 items were identified. It was suggested that the Group SCIT is capable of assembling a comprehensive picture out of partial information possessed by informed innocent participants. (PsycINFO Database Record
authors.affiliation: Ariel University.
authors.forename: Eitan
authors.initials: E
authors.lastname: Elaad
mesh_terms: D000328:Adult; D003415:Crime / Q000523:psychology; D008192:Deception; D005260:Female; D005712:Galvanic Skin Response / Q000502:physiology; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D019359:Knowledge; D008014:Lie Detection / Q000523:psychology*; D008297:Male; D009483:Neuropsychological Tests; D055815:Young Adult