The cognitive mechanisms underlying deception: an event-related potential study

Area of Science:

• Cognitive neuroscience
• Psychology
• Forensic science

Background:

• Deception is associated with a cognitive cost, often evidenced by increased reaction times compared to truthful responses.
• Event-related potentials (ERPs) offer insights into the neural mechanisms underlying the cognitive processes involved in deception.

Purpose of the Study:

• To investigate the electrophysiological correlates of deception using ERPs in a mock-crime scenario.
• To examine the effects of lying on specific ERP components, including CNV, LRP, CRN, N200, and P300.

Main Methods:

• A mock-crime experiment with 20 participants.
• Measurement of behavioral data (reaction times, errors) and electroencephalography (EEG) to record ERPs.
• Analysis of Contingent Negative Variation (CNV), Lateralized Readiness Potential (LRP), Correct Response Negativity (CRN), N200, and P300 components.

Main Results:

• Lying led to more errors and longer reaction times, consistent with previous research.
• A marginally significant increase in CNV amplitude was observed during anticipation of lying.
• A larger CRN for truth-telling compared to lying, alongside an enhanced N200 and decreased P300 for lying, was found.

Conclusions:

• The findings support the cognitive load hypothesis of deception, suggesting lying increases mental effort.
• Results present a mixed picture regarding the response conflict hypothesis.
• The study highlights the utility of ERPs in understanding the cognitive processes of deception and discusses implications for theory and practice.