Orienting versus inhibition in the Concealed Information Test: Different cognitive processes drive different...

Area of Science:

• Psychophysiology
• Forensic Psychology
• Cognitive Neuroscience

Background:

• The Concealed Information Test (CIT) is a validated method for detecting concealed knowledge through psychophysiological measures.
• Theoretical explanations for CIT responses include the orienting response (OR) and arousal inhibition (AI).
• The relative contribution of OR and AI to CIT effectiveness is not fully understood.

Purpose of the Study:

• To investigate the impact of arousal inhibition (AI) instructions on Concealed Information Test (CIT) detection efficiency.
• To differentiate the theoretical underpinnings of various psychophysiological measures within the CIT.
• To examine whether manipulating motivation to avoid detection influences CIT outcomes.

Main Methods:

• One hundred forty-eight undergraduate students participated in a CIT.
• Electrodermal, cardiac, and respiratory measures were recorded during the test.
• Participants were assigned to either a 'suspect' (motivated to avoid detection, presumably eliciting OR and AI) or 'witness' (motivated to be detected, presumably eliciting OR only) condition.

Main Results:

• Skin conductance responses to concealed items were similar across both suspect and witness groups.
• Heart rate deceleration and respiratory suppression were observed in the suspect group but not in the witness group.
• These findings suggest differential mechanisms underlying different psychophysiological measures in the CIT.

Conclusions:

• Skin conductance responses in the CIT appear to primarily reflect the orienting response (OR).
• Heart rate and respiration measures seem to be more indicative of arousal inhibition (AI).
• The study highlights the importance of considering distinct theoretical mechanisms for different psychophysiological measures in deception detection.