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Related Experiment Videos

Cerebral blood flow during anxiety provocation

M Fredrikson1, H Fischer, G Wik

  • 1Department of Clinical Psychology, Uppsala University, Sweden.

The Journal of Clinical Psychiatry
|January 1, 1997
PubMed
Summary

Traumatic reactions and phobias show distinct brain activity patterns. Positron emission tomography revealed specific regional cerebral blood flow (rCBF) changes in visual and limbic areas during fear and anxiety responses.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Traumatic reactions may stem from failed trauma integration, while phobias might be biological adaptations.
  • Central nervous system (CNS) organization could differ between traumatic and phobic reactions.
  • Understanding brain activity in anxiety and fear is crucial for differentiating these conditions.

Purpose of the Study:

  • To investigate differences in regional cerebral blood flow (rCBF) between traumatic and phobic reactions.
  • To examine brain activation patterns associated with visually induced fear and anxiety.
  • To correlate brain activity with subjective and physiological fear responses.

Main Methods:

  • Utilized positron emission tomography (PET) with [(15)O]-butanol to measure relative rCBF.
  • Studied 14 subjects with simple animal phobias exposed to phobic stimuli.
  • Examined 6 bank officials exposed to a video of a witnessed armed robbery.

Main Results:

  • Phobic stimulation increased rCBF in the secondary visual cortex but decreased it in the hippocampus and prefrontal cortex.
  • Witnessing a robbery increased rCBF in visual and posterior cingulate cortex, decreasing it in Broca's area and other regions.
  • Both conditions elevated subjective and physiological indices of fear and anxiety.

Conclusions:

  • Visually induced fear and anxiety are linked to alterations in limbic, paralimbic, and cortical brain regions.
  • Distinct patterns of rCBF changes are observed in phobic responses versus reactions to witnessed trauma.
  • These findings highlight the neurobiological underpinnings of different anxiety-related disorders.

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