Atypical waveform morphology in schizophrenia-visual evoked potential as a promising endophenotype

Area of Science:

• Neuroscience
• Psychiatry
• Clinical Neurophysiology

Background:

• Electrophysiological research utilizes visual evoked potentials (VEPs) to assess visual pathway dysfunction in schizophrenia.
• VEPs serve as a neurophysiological tool for evaluating brain activity related to visual processing.

Purpose of the Study:

• To investigate the morphology and topography of VEP responses in individuals with schizophrenia.
• To explore the potential of VEPs as an endophenotype for schizophrenia.

Main Methods:

• Cross-sectional study involving 20 schizophrenia patients from a tertiary rural hospital.
• Transient Pattern Reversal VEP recordings were obtained using an Evoked Potential Recorder.
• Patients were assessed using the Positive and Negative Symptoms Assessment Scale and Clinical Global Impression Scale for Severity.

Main Results:

• Abnormal VEP waveform morphology was observed in 70% (14/20) of patients, primarily in chronic and severe cases.
• 40% (6/15) of VEPs showed a lack of differentiation in the negative-positive-negative (NPN) complex.
• 33.33% (5/15) of VEPs exhibited altered waveforms with an extinguished second negative component.

Conclusions:

• Qualitative morphometric findings indicate pattern-reversal VEP abnormalities are linked to schizophrenia.
• VEP waveform abnormalities show potential as a biomarker for schizophrenia diagnosis.
• VEPs offer evidence for a relationship between visual pathway dysfunction and schizophrenia.