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Extinction Training During the Reconsolidation Window Prevents Recovery of Fear
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Escaping aversive exposure.

Christopher T Sege1, Margaret M Bradley1, Peter J Lang1

  • 1Department of Clinical & Health Psychology, University of Florida Center for the Study of Emotion and Attention, Gainesville, Florida, USA.

Psychophysiology
|February 21, 2017
PubMed
Summary
This summary is machine-generated.

Human defensive reactivity is heightened when facing unavoidable unpleasantness. Even if escape is possible, the body prepares for aversive events, showing increased vigilance and sympathetic nervous system activation.

Keywords:
AutonomicDefensive behaviorEscapeStartle blink

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Area of Science:

  • Psychology
  • Neuroscience
  • Human Defensive Reactivity

Background:

  • Understanding defensive responses is crucial for various psychological and neurological conditions.
  • Previous research often focused on fully escapable or inescapable aversive stimuli.

Purpose of the Study:

  • To investigate human defensive reactivity in situations where aversive events can be escaped but not entirely avoided.
  • To differentiate physiological responses during escapable versus inescapable aversive exposures.

Main Methods:

  • Participants were exposed to visual cues predicting escapable, inescapable, or neutral outcomes.
  • Acoustically elicited startle reflexes, cardiac activity (heart rate deceleration), and skin conductance were measured.
  • Physiological responses were analyzed during cue intervals preceding the aversive stimuli.

Main Results:

  • Startle reflexes were potentiated in both escapable and inescapable aversive conditions compared to neutral.
  • Later in the cue interval, startle potentiation was greater in the inescapable condition.
  • Heart rate deceleration indicated vigilance for all actions, while skin conductance showed heightened sympathetic mobilization in the escape context.

Conclusions:

  • Defensive motivation is engaged when aversive exposure is anticipated, regardless of escape possibility.
  • Startle reflexes in escape contexts involve both motor inhibition and aversive potentiation.
  • The findings provide insights into the complex interplay of avoidance, escape, and defensive reactivity.