A Concealed Information Test with multimodal measurement

Ambach, Wolfgang; Bursch, Stephanie; Stark, Rudolf; Vaitl, Dieter

doi:10.1016/j.ijpsycho.2009.12.007

Cited by 52 publications

(43 citation statements)

References 55 publications

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“…Only in recent years, a few studies tried to overcome this limitation and acquired autonomic and ERP measures within the same CIT setting (Matsuda et al, 2009, 2011; Ambach et al, 2010; Gamer and Berti, 2010). These studies mainly replicated what had already been established for separate measurements but also provided some evidence for an incremental validity of these measures.…”

Section: Introductionmentioning

confidence: 99%

“…These studies mainly replicated what had already been established for separate measurements but also provided some evidence for an incremental validity of these measures. Thus, a combination of P300 amplitudes and autonomic responses enhanced CIT validity above each single measure (Ambach et al, 2010; Matsuda et al, 2011). A comparable result was obtained for the combination of N200 amplitudes and electrodermal measures (Gamer and Berti, 2010).…”

Section: Introductionmentioning

confidence: 99%

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P300 amplitudes in the concealed information test are less affected by depth of processing than electrodermal responses

Gamer¹,

Berti²

2012

Front. Hum. Neurosci.

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The Concealed Information Test (CIT) has been used in the laboratory as well as in field applications to detect concealed crime related memories. The presentation of crime relevant details to guilty suspects has been shown to elicit enhanced N200 and P300 amplitudes of the event-related brain potentials (ERPs) as well as greater skin conductance responses (SCRs) as compared to neutral test items. These electrophysiological and electrodermal responses were found to incrementally contribute to the validity of the test, thereby suggesting that these response systems are sensitive to different psychological processes. In the current study, we tested whether depth of processing differentially affects N200, P300, and SCR amplitudes in the CIT. Twenty participants carried out a mock crime and became familiar with central and peripheral crime details. A CIT that was conducted 1 week later revealed that SCR amplitudes were larger for central details although central and peripheral items were remembered equally well in a subsequent explicit memory test. By contrast, P300 amplitudes elicited by crime related details were larger but did not differ significantly between question types. N200 amplitudes did not allow for detecting concealed knowledge in this study. These results indicate that depth of processing might be one factor that differentially affects central and autonomic nervous system responses to concealed information. Such differentiation might be highly relevant for field applications of the CIT.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

P300 amplitudes in the concealed information test are less affected by depth of processing than electrodermal responses

Gamer¹,

Berti²

2012

Front. Hum. Neurosci.

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“…The CIT study is regarded as a fundamental step contributing to the methodology used in the detection of concealed information [32]. The ERP measurement is a new approach in this field.…”

Section: Discussionmentioning

confidence: 99%

A New Approach for Concealed Information Identification Based on ERP Assessment

2011

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Recently, numerous concealed information test (CIT) studies have been done with event related potential (ERP) for its sufficient validity in applied use. In this study, a new approach based on wavelet coefficients (WCs) and kernel learning algorithm is proposed to identify concealed information. Totally 16 subjects went through the designed CIT paradigm and the multichannel electroencephalogram (EEG) signals were recorded. Then, the high-dimensional WCs of ERP in delta, theta, alpha and beta rhythms were extracted. For the analysis of the data, kernel principle component analysis (KPCA) and a support vector machines (SVM) classifier are implemented. The results show that WCs features are significant differences between concealed information and irrelevant information (P < 0.05). The KPCA is able to effectively reduce feature dimensionalities and increase generalization performance of SVM. A high accuracy (93.6%) in recognizing concealed information and irrelevant information is achieved, which indicates the combination KPCA and SVM may provide a useful tool for detecting the concealed information.

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“…Skin conductance reactions were assessed by a computerized method (see Ambach et al, 2008;Ambach et al, 2010) based on the decomposition of overlapping reactions as proposed by Lim et al (1997). This method was chosen because, two subsequent physiological reactions occurred with a short delay (due to the delay of 4 s between question and prompt to answer).…”

Section: Data Processingmentioning

confidence: 99%

Face and voice as social stimuli enhance differential physiological responding in a Concealed Information Test

Ambach

2012

International Journal of Psychophysiology

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Attentional, intentional, and motivational factors are known to influence the physiological responses in a Concealed Information Test (CIT). Although concealing information is essentially a social action closely related to motivation, CIT studies typically rely on testing participants in an environment lacking of social stimuli: subjects interact with a computer while sitting alone in an experimental room.To address this gap, we examined the influence of social stimuli on the physiological responses in a CIT. Seventy-one participants underwent a mock-crime experiment with a modified CIT. In a between-subjects design, subjects were either questioned acoustically by a pre-recorded male voice presented together with a virtual male experimenter's uniform face or by a text field on the screen, which displayed the question devoid of face and voice. Electrodermal activity (EDA), respiration line length (RLL), phasic heart rate (pHR), and finger pulse waveform length (FPWL) were registered. The Psychopathic Personality Inventory -Revised (PPI-R) was administered in addition.The differential responses of RLL, pHR, and FPWL to probe vs. irrelevant items were greater in the condition with social stimuli than in the text condition; interestingly, the differential responses of EDA did not differ between conditions. No modulatory influence of the PPI-R sum or subscale scores was found. The results emphasize the relevance of social aspects in the process of concealing information and in its detection. Attentional demands as well as the participants' motivation to avoid detection might be the important links between social stimuli and physiological responses in the CIT.

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A Concealed Information Test with multimodal measurement

Cited by 52 publications

References 55 publications

P300 amplitudes in the concealed information test are less affected by depth of processing than electrodermal responses

P300 amplitudes in the concealed information test are less affected by depth of processing than electrodermal responses

A New Approach for Concealed Information Identification Based on ERP Assessment

Face and voice as social stimuli enhance differential physiological responding in a Concealed Information Test

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