Fishy-looking liars: deception judgment from expectancy violation

Area of Science:

• Psychology
• Nonverbal Communication
• Deception Detection

Background:

• Understanding how individuals detect deception is crucial in social psychology.
• Previous research highlights the role of nonverbal cues in communication.
• Normative expectations for behavior provide a baseline for detecting deviations.

Purpose of the Study:

• To propose and test an expectancy-violation model of deception detection.
• To investigate whether nonverbal behaviors violating normative expectations are perceived as deceptive.
• To examine the cross-cultural generalizability of deception detection based on nonverbal cues.

Main Methods:

• Three experiments were conducted, with two in the United States and one in India.
• Participants described acquaintances while exhibiting unusual nonverbal behaviors (e.g., staring, head tilting).
• Observers (students and illiterates) watched videotapes and made judgments about whether deception occurred.

Main Results:

• Both American and Indian participants inferred deception from the "weird" nonverbal behaviors.
• The findings provide empirical support for the proposed expectancy-violation model.
• Deviations from expected nonverbal behavior were consistently interpreted as indicators of deception.

Conclusions:

• The expectancy-violation model effectively explains how nonverbal behavior influences deception judgments.
• Perceptions of deception are linked to deviations from established behavioral norms.
• The model's validity is supported across different cultural contexts and educational backgrounds.