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Related Experiment Videos

Perceptual changes in schizophrenia: a questionnaire survey.

O T Phillipson, J P Harris

    Psychological Medicine
    |November 1, 1985
    PubMed
    Summary

    Schizophrenia patients often experience sensory distortions, particularly in brightness contrast, which may decrease with treatment. These visual distortions are linked to hallucinations, suggesting a perceptual basis for some schizophrenia symptoms.

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    Area of Science:

    • Psychiatry
    • Neuroscience
    • Perception Psychology

    Background:

    • Schizophrenia is a complex mental disorder.
    • Sensory processing abnormalities are increasingly recognized in schizophrenia.
    • The role of perceptual disturbances in schizophrenia requires further investigation.

    Purpose of the Study:

    • To investigate the incidence of sensory distortions in individuals with probable schizophrenia.
    • To explore the relationship between sensory distortions, visual hallucinations, and treatment response.
    • To examine the potential link between perceptual malfunctions and other schizophrenic symptoms.

    Main Methods:

    • Administered questionnaires to 73 volunteers with probable schizophrenia and 67 general hospital accident ward controls.
    • Assessed the prevalence of various sensory distortions, focusing on brightness contrast.
    • Correlated self-reported distortions with visual hallucinations and treatment outcomes.

    Main Results:

    • A significantly higher incidence of sensory distortions was found in the schizophrenia group compared to controls.
    • Distortions of brightness contrast were the most frequently reported sensory abnormality.
    • Many patients reported improvement in distortions early in treatment, and these patients also tended to report visual hallucinations.

    Conclusions:

    • Sensory distortions, especially in visual perception, are common in schizophrenia.
    • The reduction of distortions with treatment suggests a dynamic perceptual process.
    • Perceptual malfunctions may contribute to the pathophysiology of other schizophrenic symptoms like delusions and catatonia.

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