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Depression vulnerability involves brain activity and connectivity changes consistent with cholinergic deviancy.

Peter Stiers1, Zoe Samara1, Kyran J R Kuijpers1

  • 1Department of Neuropsychology and Psychopharmacology, Maastricht University, 6229 ER Maastricht, The Netherlands.

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Summary
This summary is machine-generated.

Major depression (MD) involves sensory processing deficits, potentially linked to acetylcholine. Brain imaging reveals shared neural changes in individuals at risk for MD and those with the disorder, even before symptom onset.

Keywords:
AcetylcholineFace perceptionMajor depression disorderResting-state functional connectivityTask-related fMRIVisual attention network

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Major depression (MD) is associated with emotional perception biases and sensory processing deficits.
  • Increased cortical acetylcholine in MD suggests abnormal attention modulation of sensory areas.
  • It remains unclear if these deficits precede or are a consequence of MD.

Purpose of the Study:

  • To investigate shared brain activity changes in individuals at familial risk for MD and those with MD compared to controls.
  • To determine if these neural alterations are present before the onset of MD symptoms.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to scan participants.
  • Participants included individuals with MD, those at familial risk for MD, and matched controls.
  • Scans were performed during a face gender categorization task (sad, happy, neutral faces) and at rest.

Main Results:

  • Shared task-related activity changes in at-risk and MD groups were observed in posterior brain regions, including increased dorsal attention and visual association cortex activity, and decreased lower visual area activity.
  • These changes were consistent across neutral and emotional faces.
  • Increased functional connectivity was found between dorsal attention clusters and the lingual gyrus, and decreased connectivity with the lateral occipital complex (LOC) in at-risk and MD groups.
  • Both groups also showed increased functional connectivity between magnocellular basal forebrain and LOC/visual association cortex.

Conclusions:

  • The findings suggest an acetylcholine-mediated alteration in attention-guided sensory processing affecting all environmental stimuli.
  • These neural changes are discernible prior to the first episode of major depression, indicating they may be a preclinical marker.
  • This research provides insights into the neurobiological underpinnings of major depression risk and early pathophysiology.