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Psychosis subgroups differ in intrinsic neural activity but not task-specific processing.

Matthew E Hudgens-Haney1, Lauren E Ethridge2, Jennifer E McDowell3

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This study reveals distinct neurophysiological profiles in psychosis subgroups, differentiating between high and low intrinsic neural activity. These findings suggest neurobiological subgrouping may improve understanding of psychosis mechanisms.

Keywords:
BiomarkersBipolar disorderEEGPsychosisSchizophreniaSteady-state

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Individuals with psychosis often exhibit altered intrinsic neural activity and cognitive deficits.
  • Previous models proposed subgroups with either accentuated or diminished intrinsic activity.

Purpose of the Study:

  • To investigate a neurobiological model of psychosis subgroups based on intrinsic neural activity.
  • To assess neural activity during a pro-/anti-saccade task in psychosis probands.

Main Methods:

  • Assessed neural activity in 105 psychosis probands during baseline and task preparation.
  • Utilized steady-state stimuli for real-time visuocortical modulation assessment.
  • Analyzed intrinsic neural activity, oscillatory phase synchrony, and task performance.

Main Results:

  • Biotype-1 (diminished intrinsic activity) showed the worst performance; Biotype-2 (accentuated intrinsic activity) showed less deviant behavior.
  • Both subgroups exhibited less dynamic oscillatory phase synchrony.
  • All psychosis subgroups displayed normal preparatory modulation of visuocortical investment.

Conclusions:

  • Intrinsic neural activity differences may be a core feature of psychosis, distinct from stimulus-specific responses.
  • Multidimensional neurobiological classification may offer advantages over traditional diagnostic methods for understanding psychosis heterogeneity and mechanisms.