@article{SuchotzkiMayGamer2020,
  author    = {Suchotzki, Kristina and May, Heidi and Gamer, Matthias},
  title     = {No effect of moderate alcohol intake on the detection of concealed identity information in the laboratory},
  series = {Scientific Reports},
  volume    = {10},
  journal   = {Scientific Reports},
  doi       = {10.1038/s41598-020-76811-x},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-231208},
  year      = {2020},
  abstract  = {The Concealed Information Test (CIT) enables the detection of certain (e.g., crime-relevant or personal) information, even if participants aim to conceal their knowledge. The current preregistered study investigated whether previously observed impairing effects of alcohol intoxication on participants' performance in a reaction time CIT (RT CIT) field study also translate to a laboratory environment. In contrast to the previous study of Suchotzki and Gamer (Sci Rep 8:7825, 2018) in which alcohol consumption was voluntary and self-administered, the current study used a randomized assignment of participants to either an alcohol group (n=88; receiving a drink with 3 cl alcohol) or a sober control group (n=89; receiving a drink with just some alcohol drops to hide group assignment). After drink administration, participants completed an RT CIT, in which they were instructed to hide knowledge of their own identity. Blood alcohol concentration (BAC) was estimated via breath alcohol ratio. In contrast to the previous field study, results revealed no differences in CIT-performance between intoxicated and sober participants. Aside from questioning the robustness of the result of the previous field study, our results also point to a number of interesting theoretical explanations for the discrepancy between both results, which are elaborated in the discussion.},
  language  = {en}
}
@article{SuchotzkiKakavandGamer2019,
  author    = {Suchotzki, Kristina and Kakavand, Aileen and Gamer, Matthias},
  title     = {Validity of the reaction time concealed information test in a prison sample},
  series = {Frontiers in Psychiatry},
  volume    = {9},
  journal   = {Frontiers in Psychiatry},
  number    = {745},
  doi       = {10.3389/fpsyt.2018.00745},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-177714},
  year      = {2019},
  abstract  = {Detecting whether a suspect possesses incriminating (e.g., crime-related) information can provide valuable decision aids in court. To this means, the Concealed Information Test (CIT) has been developed and is currently applied on a regular basis in Japan. But whereas research has revealed a high validity of the CIT in student and normal populations, research investigating its validity in forensic samples in scarce. This applies even more to the reaction time-based CIT (RT-CIT), where no such research is available so far. The current study tested the application of the RT-CIT for an imaginary mock crime scenario both in a sample of prisoners (n = 27) and a matched control group (n = 25). Results revealed a high validity of the RT-CIT for discriminating between crime-related and crime-unrelated information, visible in medium to very high effect sizes for error rates and reaction times. Interestingly, in accordance with theories that criminal offenders may have worse response inhibition capacities and that response inhibition plays a crucial role in the RT-CIT, CIT-effects in the error rates were even elevated in the prisoners compared to the control group. No support for this hypothesis could, however, be found in reaction time CIT-effects. Also, performance in a standard Stroop task, that was conducted to measure executive functioning, did not differ between both groups and no correlation was found between Stroop task performance and performance in the RT-CIT. Despite frequently raised concerns that the RT-CIT may not be applicable in non-student and forensic populations, our results thereby do suggest that such a use may be possible and that effects seem to be quite large. Future research should build up on these findings by increasing the realism of the crime and interrogation situation and by further investigating the replicability and the theoretical substantiation of increased effects in non-student and forensic samples.},
  language  = {en}
}
@article{SuchotzkiGamer2018,
  author    = {Suchotzki, Kristina and Gamer, Matthias},
  title     = {Alcohol facilitates detection of concealed identity information},
  series = {Scientific Reports},
  volume    = {8},
  journal   = {Scientific Reports},
  number    = {7825},
  doi       = {10.1038/s41598-018-25811-z},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-176662},
  year      = {2018},
  abstract  = {The Concealed Information Test (CIT) is a well-validated means to detect whether someone possesses certain (e.g., crime-relevant) information. The current study investigated whether alcohol intoxication during CIT administration influences reaction time (RT) CIT-effects. Two opposing predictions can be made. First, by decreasing attention to critical information, alcohol intoxication could diminish CIT-effects. Second, by hampering the inhibition of truthful responses, alcohol intoxication could increase CIT-effects. A correlational field design was employed. Participants (n = 42) were recruited and tested at a bar, where alcohol consumption was voluntary and incidental. Participants completed a CIT, in which they were instructed to hide knowledge of their true identity. BAC was estimated via breath alcohol ratio. Results revealed that higher BAC levels were correlated with higher CIT-effects. Our results demonstrate that robust CIT effects can be obtained even when testing conditions differ from typical laboratory settings and strengthen the idea that response inhibition contributes to the RT-CIT effect.},
  language  = {en}
}
@article{kleinSelleSuchotzkiPertzovetal.2023,
  author    = {klein Selle, Nathalie and Suchotzki, Kristina and Pertzov, Yoni and Gamer, Matthias},
  title     = {Orienting versus inhibition: The theory behind the ocular-based Concealed Information Test},
  series = {Psychophysiology},
  volume    = {60},
  journal   = {Psychophysiology},
  number    = {3},
  doi       = {10.1111/psyp.14186},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-312626},
  year      = {2023},
  abstract  = {When trying to conceal one's knowledge, various ocular changes occur. However, which cognitive mechanisms drive these changes? Do orienting or inhibition—two processes previously associated with autonomic changes—play a role? To answer this question, we used a Concealed Information Test (CIT) in which participants were either motivated to conceal (orienting + inhibition) or reveal (orienting only) their knowledge. While pupil size increased in both motivational conditions, the fixation and blink CIT effects were confined to the conceal condition. These results were mirrored in autonomic changes, with skin conductance increasing in both conditions while heart rate decreased solely under motivation to conceal. Thus, different cognitive mechanisms seem to drive ocular responses. Pupil size appears to be linked to the orienting of attention (akin to skin conductance changes), while fixations and blinks rather seem to reflect arousal inhibition (comparable to heart rate changes). This knowledge strengthens CIT theory and illuminates the relationship between ocular and autonomic activity.},
  language  = {en}
}