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Frequency specific resting state functional abnormalities in psychosis.

Suril Gohel1, Juan A Gallego2,3, Delbert G Robinson4,5,6

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Summary
This summary is machine-generated.

Resting-state functional magnetic resonance imaging (fMRI) in psychosis reveals altered blood oxygen level dependent (BOLD) signal fluctuations across different frequency bands, particularly in visual and motor networks. These differences were observed in both early and chronic stages of psychosis.

Keywords:
first-episodefrequency bandsresting state fMRIschizophrenia

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Neuroimaging

Background:

  • Resting-state functional magnetic resonance imaging (fMRI) studies in psychosis typically examine low-frequency blood oxygen level dependent (BOLD) signal fluctuations (0.01-0.1 Hz).
  • Limited research has explored BOLD signal fluctuations in higher frequency bands and their relevance across different psychosis stages.

Purpose of the Study:

  • To investigate blood oxygen level dependent (BOLD) signal fluctuations within specific frequency bands (slow-4, slow-3, slow-2) in patients with first-episode or chronic psychosis compared to healthy volunteers.
  • To identify differences in the amplitude of frequency fluctuations across various resting-state brain networks.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) data were acquired from 89 patients with psychosis (first-episode or chronic) and 119 healthy volunteers.
  • Blood oxygen level dependent (BOLD) signal fluctuations were analyzed within three frequency ranges: slow-4 (0.027-0.073 Hz), slow-3 (0.074-0.198 Hz), and slow-2 (0.199-0.25 Hz).
  • Analyses were conducted across 47 regions-of-interest within 14 resting-state networks identified via group independent component analysis.

Main Results:

  • Significant group-by-frequency interactions were observed in visual and motor cortex networks.
  • Healthy volunteers exhibited higher amplitude of frequency fluctuations than patients in visual, dorsal attention, and motor cortex networks across all analyzed frequency bands.
  • Conversely, patients showed higher amplitude fluctuations than healthy volunteers in the salience and frontal gyrus networks.
  • These findings were consistent in both first-episode and chronic psychosis groups.

Conclusions:

  • Altered blood oxygen level dependent (BOLD) signal fluctuation amplitudes across different frequency bands are characteristic of psychosis, extending beyond traditional low-frequency analyses.
  • These neuroimaging findings highlight the importance of examining diverse frequency bands in the blood oxygen level dependent (BOLD) signal for understanding the neurobiology of psychosis.
  • The observed differences in specific brain networks suggest potential network-specific disruptions in psychosis pathophysiology.