Event-Related Potential Biomarkers in Schizophrenia
Summary
Event-related potentials (ERPs) offer non-invasive windows into the timing and integrity of neural processes that are disrupted in schizophrenia. Early sensory components such as the P50 and N100 reveal deficits in sensory gating, indicating an impaired ability to filter repetitive or irrelevant information. The mismatch negativity (MMN) reflects pre-attentive auditory change detection and is consistently attenuated in patients and often in individuals at clinical high risk. Later cognitive components, most notably the P300 (P3b), exhibit reduced amplitude and prolonged latency in first-episode and chronic stages, pointing to deficits in attention allocation and context updating. These alterations serve both as state markers of current illness severity and as trait or endophenotypic markers of genetic liability, with some ERP abnormalities observed in unaffected relatives. In recent years, studies have linked specific ERP profiles to functional outcomes, conversion risk in prodromal cohorts and response to cognitive remediation. Advances in signal processing and machine-learning approaches have further refined intra-individual variability metrics, enabling more precise characterisation of temporal precision in neural synchrony. Collectively, ERP biomarkers promise globally accessible tools for early detection, patient stratification and monitoring treatment efficacy in schizophrenia, with the potential to guide personalised intervention strategies.
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Event-Related Potential Biomarkers in Schizophrenia publication trend
The graph below shows the total number of articles in event-related potential biomarkers in schizophrenia across all publications each year (not limited to Nature Index journals).
Technical terms
Event-related potential (ERP): Brain response measured by EEG that is time-locked to specific sensory or cognitive events.
P300 (P3b): A positive waveform peaking around 300 ms post-stimulus, associated with attention allocation and stimulus evaluation.
N100: An early negative deflection around 100 ms post-stimulus reflecting initial sensory processing.
Mismatch negativity (MMN): An automatic response to unexpected deviations in a sequence of auditory stimuli, reflecting pre-attentive auditory processing.
Sensory gating: The neural mechanism of filtering repetitive or irrelevant stimuli, often assessed via suppression of the P50 or N100 components.
Endophenotype: A heritable biomarker or trait that mediates the genetic risk for a disorder.
Inter-trial phase coherence (ITC): A measure of trial-to-trial consistency of EEG signal phase, indicating temporal precision of neural responses.
References
- Is auditory processing measured by the N100 an endophenotype for psychosis? A family study and a meta-analysis.. Psychological Medicine (2023).
- The specificity of the auditory P300 responses and its association with clinical outcomes in youth with psychosis risk syndrome. International Journal of Clinical and Health Psychology (2024).
- Do smaller P300 amplitudes in schizophrenia result from larger variability in temporal processing?. Schizophrenia (2024).
- Intraindividual Variability of Event-Related Potentials in Psychosis: A Registered Report. Biological Psychiatry Global Open Science (2024).
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