The concealed information test is designed to detect concealed knowledge through differential physiological responses elicited by the concealed items. This study was designed to examine the role of retroactive interference (RI) as a potential countermeasure that may weaken memory traces of the concealed items and attenuate the physiological responses elicited by them. A total of 120 participants committed a mock crime and were randomly assigned to either an interference condition, where they learned and retrieved an alternative mock crime, or a control condition. Further, each group was randomly assigned to one of three "time-delay" conditions. The results revealed that both memory for the mock crime details and the skin conductance responses (SCRs) to these details were attenuated under the memory-interference condition. Time of testing affected recall, but had no effect on the SCRs. In addition, the memory-interference manipulation had no effect on the respiration measure. Theoretical and practical implications of these results are discussed.
Bibliographical noteFunding Information:
This research was funded by a grant No. 408/09 from the Israel Science Foundation to Gershon Ben-Shakhar. We thank Noam Markovitch, Reut Shilo, Gidi Aviram and Tal Nahari for their assistance in data collection.
© 2015 Elsevier B.V.
Copyright 2016 Elsevier B.V., All rights reserved.
- Concealed-information test
- Knowledge detection
- Retrieval-induced forgetting
- Retroactive memory interference