Manipulating item proportion and deception reveals crucial dissociation between behavioral, autonomic and neural indices of concealed information
-
1
Ghent University, Belgium
-
2
University Medical Center Hamburg-Eppendorf, Germany
-
3
University of Amsterdam, The Netherlands
Developed as alternative to traditional deception detection methods, the Concealed Information Test (CIT) assesses recognition of critical (e.g., crime-relevant) 'probes'. Most often, recognition has been indexed by enhanced skin conductance responses (SCRs) to probes compared to irrelevant foils (CIT effect). More recently, also differentially enlarged reaction times (RTs) and increased neural activity in the bilateral inferior frontal gyrus (IFG), the right middle frontal gyrus (rMFG), and the right temporo-parietal junction (rTPJ) have been observed. The current functional magnetic resonance imaging (fMRI) study manipulated the proportion of probe versus irrelevant items, and whether suspects were to actively deceive during the test. Thereby, we aimed to (1) investigate the boundary conditions of the CIT effect in all three indices and (2) gain more insight into the contribution of two mechanisms that have been proposed to underlie the CIT effect (orienting vs. response inhibition). After conducting a mock-theft, 32 participants underwent a CIT during which RTs, SCRs, and BOLD responses were recorded. Results revealed that all CIT effects were larger when a 1:4 proportion was used compared to a 1:1 proportion, and when knowledge of critical crime-details was (deceptively) denied compared to when it was admitted. CIT effect sizes for all conditions further revealed a dissociation between indices. Whereas deception was not necessary for the SCR CIT effect, it was crucial for the RT and the fMRI-based CIT effects. This indicates that different mental processes might underlie the CIT response pattern. While skin conductance responding may be best explained by orienting theory, response inhibition seems to drive RT and BOLD responding to concealed information. Interfering with response inhibition capacities may be a promising approach to enhance RT and fMRI-based concealed information detection, whereas enhancing orienting should increase the SCR CIT effect.
Keywords:
Reaction Time,
deception,
fMRI,
response inhibition,
Orienting,
Skin conductance,
guilty knowledge,
concealed information,
right inferior frontal gyrus,
Proportion
Conference:
XII International Conference on Cognitive Neuroscience (ICON-XII), Brisbane, Queensland, Australia, 27 Jul - 31 Jul, 2014.
Presentation Type:
Poster
Topic:
Cognition and Executive Processes
Citation:
Suchotzki
K,
Verschuere
B,
Peth
J,
Crombez
G and
Gamer
M
(2015). Manipulating item proportion and deception reveals crucial dissociation between behavioral, autonomic and neural indices of concealed information.
Conference Abstract:
XII International Conference on Cognitive Neuroscience (ICON-XII).
doi: 10.3389/conf.fnhum.2015.217.00392
Copyright:
The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers.
They are made available through the Frontiers publishing platform as a service to conference organizers and presenters.
The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated.
Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed.
For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions.
Received:
19 Feb 2015;
Published Online:
24 Apr 2015.
*
Correspondence:
Ms. Kristina Suchotzki, Ghent University, Ghent, Belgium, kristina.suchotzki@uni-wuerzburg.de