The Concealed Information Test (CIT) is a scientifically validated technique used in forensic psychophysiology that allows for the detection of concealed memories using physiological response. In a typical CIT, critical items concerning the details of the crime known only to the perpetrator and the investigative authorities are used. However, when the critical items are not known, examiners use Searching CIT (SCIT). The purpose of this study is to examine whether physiological responses depend on the ordinary type or unlimited type of question series. Fifteen undergraduate students were instructed to go to an office room and steal a certain
sweet
(
candy
, chocolate, cookie, nuts or gummies) from a table, then hide it somewhere in the room. The skin conductance response (SCR), heart rate and respiration activity were recorded. The examiner first presented the ordinary condition which comprised of only critical and noncritical items, and then conducted a different type of question series including an unlimited item (catch-all item). The results indicated that critical items elicited the SCR significantly stronger than the noncritical items in both question series. It was concluded that the use of a catch-all item didn't affect the differences between critical and noncritical items.
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