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Related Experiment Video

Updated: May 10, 2026

Using the Threat Probability Task to Assess Anxiety and Fear During Uncertain and Certain Threat
11:18

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Published on: September 12, 2014

Pathological anxiety and function/dysfunction in the brain's fear/defense circuitry.

Peter J Lang1, Lisa M McTeague1, Margaret M Bradley1

  • 1Center for the Study of Emotion & Attention, University of Florida, FL, USA.

Restorative Neurology and Neuroscience
|June 20, 2013
PubMed
Summary

Neurobiological measures can objectively differentiate anxiety disorder symptom patterns by examining brain circuit dysfunction. Startle reflex and functional MRI (fMRI) show variations across the anxiety spectrum, aiding in diagnosis and treatment.

Keywords:
GADImageryPTSDanxietychronicitycomorbiditydepressiondiagnostic subtypesemotional reactivityfMRIpanicpsychophysiologyreal-time fMRIsocial phobiaspecific phobiastartletrauma

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Psychology

Background:

  • Anxiety and mood disorders are viewed as brain disorders stemming from neural circuit dysfunction.
  • Maladaptive plasticity in fear/defense and appetitive/reward circuits contributes to these pathologies.

Purpose of the Study:

  • To develop objective neurobiological measures for discriminating anxiety disorder symptom patterns.
  • To investigate the role of specific brain circuits in anxiety spectrum disorders.

Main Methods:

  • Review of studies on probe startle reflex during fear memory processing.
  • Analysis of functional magnetic resonance imaging (fMRI) data.
  • Exploration of real-time fMRI feedback for circuit analysis and regulation.

Main Results:

  • An enhanced startle reflex during fear memory processing correlates with anxiety pathology severity.
  • This startle reflex variation spans a spectrum from focal fear to blunted reactions in generalized anxiety and mood disorders.
  • Preliminary fMRI studies suggest fear/defense circuit dysfunction aligns with this psychopathology dimension.

Conclusions:

  • Neurobiological measures, like startle reflex and fMRI, can objectively differentiate anxiety disorder subtypes.
  • Understanding brain circuit dysfunction is crucial for diagnosing and treating severe anxiety and mood disorders.
  • Real-time fMRI holds potential for circuit analysis and therapeutic intervention in blunted affect.