Determinants of neurological dysfunction in first episode schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Clinical Psychology

Background:

• Subtle neurological impairments are recognized in schizophrenia.
• The etiological and clinical relevance of these impairments remains unclear.

Purpose of the Study:

• To investigate the nature and influencing factors of neurological soft signs in first-episode schizophrenia.
• To determine if neurological impairment is treatment-related or intrinsic to schizophrenia.

Main Methods:

• Utilized validated neurological examinations on patients with first-episode schizophrenia or schizophreniform psychosis.
• Assessed neuroleptic-naive patients and those medicated for less than one month.
• Examined the influence of symptomatology and handedness on neurological functioning.

Main Results:

• Most neuroleptic-naive patients exhibited neurodysfunction.
• Handedness and symptomatology significantly explained variance in neurological functioning.
• Mixed-handedness correlated with greater impairment, poorer academic history, and pre-morbid social adjustment.

Conclusions:

• Neurological soft signs are intrinsic to schizophrenia, not a treatment side effect.
• Early developmental factors influence neurological impairment in early schizophrenia.
• Symptomatology affects the apparent severity of neurological impairment.