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Biological Causes of Schizophrenia01:29

Biological Causes of Schizophrenia

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Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
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Altered states of consciousness represent significant deviations from one's normal mental state. These deviations can range from subtle changes in awareness to profound transformations in perception, thought processes, and sensory experiences. Altered states of consciousness can be triggered by various factors, including drug use, meditation, hypnosis, illness, or even intense fatigue.
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This summary is machine-generated.

This study reveals altered brain-behavior connections in psychosis. A specific brain circuit

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Cognitive deficits and neuroimaging alterations in psychosis may indicate disrupted brain-behavior interactions.
  • Understanding these interactions across psychosis stages is crucial for identifying biomarkers.

Purpose of the Study:

  • To investigate the association between cognitive functioning and functional brain connectivity in neurotypical controls (NC), patients with chronic psychosis (PSY), and individuals with subthreshold psychotic symptoms (STPS).
  • To identify replicable brain-behavior markers across different stages of psychosis.

Main Methods:

  • Utilized resting-state functional magnetic resonance imaging (fMRI) data from 1,203 participants across multiple cohorts.
  • Applied graph connectivity-based approaches to analyze functional connectivity and cognitive performance (Wisconsin Card Sorting Test).
  • Tested associations in NC and validated findings in PSY, STPS, and external cohorts.

Main Results:

  • In NC, a positive correlation was found between a right prefrontal-cingulum-striatal circuit's degree centrality and Wisconsin Card Sorting Test errors.
  • In PSY and STPS, this association reversed to a negative correlation, a finding consistently replicated across cohorts.
  • Alterations in the brain-behavior association were replicable across psychosis stages, unlike group differences in centrality or cognition alone.

Conclusions:

  • Identified a replicable alteration in the brain-behavior association related to a specific circuit in psychosis.
  • This multimodal marker holds potential for early risk identification and warrants further longitudinal investigation.
  • The findings underscore the utility of graph connectivity in understanding psychosis pathophysiology.