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Brain changes and negative symptoms in schizophrenia

¹University Department of Psychiatry, Warneford Hospital, Oxford, UK.

Psychopathology

|January 1, 1995

Summary

Negative symptoms in schizophrenia may stem from disrupted brain development, potentially linked to cerebral asymmetry and sexual selection. This research explores the connection between brain development, negative symptoms, and human personality diversity.

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Area of Science:

Neuroscience
Psychiatry
Evolutionary Psychology

Background:

Negative symptoms and cognitive impairments in schizophrenia correlate with early onset and poor outcomes.
Evidence suggests a link between schizophrenia symptoms and arrested brain development, though the exact relationship remains unclear.
Previous studies indicate negative symptoms are associated with reduced brain length (post-mortem) and sulcal cerebrospinal fluid (CSF) asymmetry (MRI).

Purpose of the Study:

To explore the relationship between arrested brain development and negative symptoms in schizophrenia.
To propose a theoretical framework linking psychosis, negative symptoms, and human personality diversity through sexual selection and cerebral asymmetry.

Main Methods:

Review of existing post-mortem and MRI studies on schizophrenia.
Theoretical synthesis of findings related to brain development, asymmetry, and evolutionary principles.

Main Results:

Negative symptoms in schizophrenia are associated with neurodevelopmental alterations.
Cerebral asymmetry may play a role in the manifestation of negative symptoms.
A novel hypothesis proposes that psychosis and negative symptoms are part of human personality diversity shaped by sexual selection.

Conclusions:

Negative symptoms in schizophrenia may be linked to an arrest in brain development.
Cerebral asymmetry is implicated in the pathophysiology of schizophrenia.
The study proposes an evolutionary framework, involving sexual selection and dimorphism, to understand psychosis and negative symptoms within the spectrum of human personality.

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