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Abstracts
  • Volz, K., Bahr, L.-M., Heinrichs, M., Vaitl, D., & Ambach, W. (2018). The Concealed Information Test is Susceptible to Misleading Information. Journal of Forensic Sciences, 63(5), 1419–1428. https://doi.org/10.1111/1556-4029.13718

    An approach toward detecting hidden knowledge is the Concealed Information Test (CIT). It relies on the memory of crime-relevant information. This study investigated whether its validity is susceptible to memory distortion by misleading information. A misleading information paradigm was employed to distort memory prior to an interrogation with a CIT. Forty-one participants watched a video with specific crime-related information. After a 1-week retention interval, misleading information was introduced. Afterward, a CIT was performed, followed by a threefold memory test. When misleading information was presented, memory performance was reduced, and no physiological response differences between crime-relevant and crime-irrelevant information were found. Without presenting misleading information, physiological responses differed between responses to crime-relevant and crime-irrelevant information. However, responses in all physiological measures also differed between misleading and irrelevant information. The results indicate that the CIT is susceptible to misleading information, which reduces its validity in specific constellations.

  • Ambach, W., Bursch, S., Stark, R., & Vaitl, D. (2010). A Concealed Information Test with multimodal measurement. International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology, 75(3), 258–267. https://doi.org/10.1016/j.ijpsycho.2009.12.007

    A Concealed Information Test (CIT) investigates differential physiological responses to deed-related (probe) vs. irrelevant items. The present study focused on the detection of concealed information using simultaneous recordings of autonomic and brain electrical measures. As a secondary issue, verbal and pictorial presentations were compared with respect to their influence on the recorded measures. Thirty-one participants underwent a mock-crime scenario with a combined verbal and pictorial presentation of nine items. The subsequent CIT, designed with respect to event-related potential (ERP) measurement, used a 3-3.5s interstimulus interval. The item presentation modality, i.e. pictures or written words, was varied between subjects; no response was required from the participants. In addition to electroencephalogram (EEG), electrodermal activity (EDA), electrocardiogram (ECG), respiratory activity, and finger plethysmogram were recorded. A significant probe-vs.-irrelevant effect was found for each of the measures. Compared to sole ERP measurement, the combination of ERP and EDA yielded incremental information for detecting concealed information. Although, EDA per se did not reach the predictive value known from studies primarily designed for peripheral physiological measurement. Presentation modality neither influenced the detection accuracy for autonomic measures nor EEG measures; this underpins the equivalence of verbal and pictorial item presentation in a CIT, regardless of the physiological measures recorded. Future studies should further clarify whether the incremental validity observed in the present study reflects a differential sensitivity of ERP and EDA to different sub-processes in a CIT.

  • Ambach, W., Stark, R., Peper, M., & Vaitl, D. (2008). An interfering Go/No-go task does not affect accuracy in a Concealed Information Test. International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology, 68(1), 6–16. https://doi.org/10.1016/j.ijpsycho.2007.11.004

    Following the idea that response inhibition processes play a central role in concealing information, the present study investigated the influence of a Go/No-go task as an interfering mental activity, performed parallel to the Concealed Information Test (CIT), on the detectability of concealed information. 40 undergraduate students participated in a mock-crime experiment and simultaneously performed a CIT and a Go/No-go task. Electrodermal activity (EDA), respiration line length (RLL), heart rate (HR) and finger pulse waveform length (FPWL) were registered. Reaction times were recorded as behavioral measures in the Go/No-go task as well as in the CIT. As a within-subject control condition, the CIT was also applied without an additional task. The parallel task did not influence the mean differences of the physiological measures of the mock-crime-related probe and the irrelevant items. This finding might possibly be due to the fact that the applied parallel task induced a tonic rather than a phasic mental activity, which did not influence differential responding to CIT items. No physiological evidence for an interaction between the parallel task and sub-processes of deception (e.g. inhibition) was found. Subjects' performance in the Go/No-go parallel task did not contribute to the detection of concealed information. Generalizability needs further investigations of different variations of the parallel task.

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Last update from database: 04.06.25, 15:35 (UTC)