Stressor controllability modulates fear extinction in humans

Area of Science:

• Psychology
• Neuroscience
• Psychophysiology

Background:

• Traumatic events are linked to anxiety disorders, but not all exposed individuals develop pathological fear.
• Control over aversive experiences is a key factor in determining behavioral outcomes, as suggested by animal models.

Purpose of the Study:

• To investigate if stressor controllability influences conditioned fear expression in humans.
• To explore the role of perceived control in psychological resilience and vulnerability following stress.

Main Methods:

• Human participants were assigned to escapable stress, yoked inescapable stress, or no-stress control groups.
• Fear conditioning, extinction, and extinction retrieval tests were conducted one week after stress exposure.
• Behavioral measures of fear expression and extinction learning were analyzed.

Main Results:

• Inescapable stress led to impaired fear extinction learning and heightened fear expression.
• Escapable stress improved fear extinction and reduced spontaneous fear recovery.
• Findings align with animal models showing bidirectional effects of controllability on stress responses.

Conclusions:

• The degree of control over aversive experiences significantly modulates human fear responses.
• Stressor controllability is a critical factor in developing psychological resilience or vulnerability.
• These findings have implications for understanding and treating anxiety disorders.