In Japan's police, Concealed Information Test (CIT) has been widely used in crime investigation to investigate whether an examinee knows the hidden details that only the person who committed a crime (or was involved in it) should know.

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CIT is performed using different psychophysiological measurements: heart rate, skin conductance response, respiration, and normalized pulse volume.

 

Our research focuses on the process of question formulation in CIT and issues related to the objectivity and validity of the testing results.