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The bed nucleus of the stria terminalis (BNST) and central amygdala (CeA) show altered brain connectivity during threat anticipation. Their connections weaken with certain brain regions but strengthen with others, offering insights into anxiety.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychiatry

Background:

  • The bed nucleus of the stria terminalis (BNST) and central amygdala (CeA) are key extended amygdala regions involved in threat processing.
  • These regions mediate responses to sustained and phasic threat stimuli, respectively, through interconnected networks.
  • Previous research mapped resting functional connectivity of BNST and CeA at high resolution.

Purpose of the Study:

  • To investigate changes in BNST and CeA functional connectivity during sustained anticipation of electric shock.
  • To contrast network alterations under threat versus safety conditions.

Main Methods:

  • High-resolution functional connectivity mapping using 7 Tesla MRI.
  • Analysis of brain network changes in BNST and CeA during a sustained threat anticipation task.
  • Exploratory whole-brain connectivity analysis.

Main Results:

  • BNST and CeA exhibited decreased coupling with the ventromedial prefrontal cortex (vmPFC), cingulate, and nucleus accumbens under threat compared to safety.
  • CeA showed increased coupling with the thalamus during threat anticipation.
  • While BNST/CeA connectivity generally decreased, other cortical regions showed increased coupling under threat.

Conclusions:

  • Threat anticipation dynamically alters functional connectivity networks of the BNST and CeA.
  • Differential network changes in BNST and CeA contribute to processing threat stimuli.
  • Understanding these network dynamics is crucial for elucidating the neural basis of anxiety states.