Acute psychological stress promotes implicit aggression: Evidence from behavior and ERPs

Area of Science:

• Neuroscience
• Psychology
• Social Psychology

Background:

• Acute stress influences explicit aggression via "fight or flight" or "tend and befriend" responses.
• The effect of acute stress on implicit aggression is less understood.
• Implicit aggression involves automatic, unconscious associations.

Purpose of the Study:

• To investigate the impact of acute stress on implicit aggression.
• To examine neural correlates of implicit aggression using event-related potentials (ERPs).

Main Methods:

• 55 healthy individuals were assigned to a stress (Trier Social Stress Test - TSST) or control group.
• Electroencephalogram (EEG) data were collected during the Single Target-Implicit Association Test (ST-IAT).
• ERPs, including N2, P2, P3, and N400 components, were analyzed.

Main Results:

• Acute stress strengthened associations between self-related and aggressive words.
• TSST group showed smaller N2 and N400 amplitudes compared to the control group.
• The ST-IAT's compatible task elicited a larger P2 amplitude than the incompatible task.

Conclusions:

• Findings support the "fight or flight" model of stress response.
• Acute stress appears to prime aggressive responses at an implicit level.
• Neural markers indicate altered cognitive processing of aggressive stimuli under stress.