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Negative and Cognitive Symptoms of Schizophrenia01:30

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Negative symptoms of schizophrenia indicate a reduction or absence of typical behaviors and emotional responses found in healthy individuals, while positive symptoms reflect an excess or distortion of normal functioning.
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Related Experiment Video

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Beyond severity: Mapping cognitive heterogeneity in schizophrenia at the structural level.

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    Cognitive heterogeneity in schizophrenia (SCZ) involves global deviation and structural changes. A new framework, norm-anchored cognitive structural deviation (NCSD), refines the understanding of these cognitive differences.

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    Area of Science:

    • Neuroscience
    • Psychiatry
    • Cognitive Psychology

    Background:

    • Cognitive heterogeneity is a key characteristic of schizophrenia (SCZ).
    • Current methods using domain-specific scores may not fully capture the complex cognitive structure in SCZ.
    • A novel approach is needed to better understand cognitive variations in schizophrenia.

    Purpose of the Study:

    • To develop and validate a norm-anchored cognitive structural deviation (NCSD) framework to analyze cognitive heterogeneity in SCZ.
    • To investigate global and structural cognitive deviations in SCZ patients compared to healthy controls (HC).
    • To quantify these deviations using novel indices and explore their clinical associations.

    Main Methods:

    • Developed a norm-anchored latent cognitive structure (N-LCS) derived from healthy controls (HC).
    • Applied the NCSD framework to assess cognitive performance in SCZ patients, quantifying global deviation (CNDI) and structural alterations (LPD, CSD).
    • Validated the N-LCS in an independent cohort and performed robustness analyses for SCZ-specific findings.

    Main Results:

    • The N-LCS demonstrated stability and validity in distinguishing cognitive structures.
    • SCZ patients exhibited significant global deviation (CNDI) from the N-LCS and altered executive function indicator patterns (LPD).
    • Correlation patterns among cognitive measures differed between SCZ and HC (CSD), with LPD and CSD associated with anxiety and positive symptoms.

    Conclusions:

    • Cognitive heterogeneity in SCZ encompasses both global deviations and alterations in cognitive structure.
    • The NCSD framework offers a refined method for characterizing cognitive heterogeneity in SCZ.
    • This approach may advance precision psychiatry and strategies for functional recovery in schizophrenia.