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P300 reduction and prolongation with illness duration in schizophrenia
D H Mathalon1, J M Ford, M Rosenbloom
1Psychiatry Service, Veterans Affairs Palo Alto Health Care System, Palo Alto, California, USA.
Biological Psychiatry
|March 8, 2000
Summary
Schizophrenia is associated with reduced P300 amplitude and delayed latency, worsening with longer illness duration. This suggests a progressive neurodegenerative process in schizophrenia patients.
Area of Science:
- Neuroscience
- Psychiatry
Background:
- The P300 component of auditory event-related potentials (ERPs) is known to be affected in schizophrenia, showing reduced amplitude and delayed latency.
- Aging and neurodegenerative disorders also impact P300, causing prolonged latency and sometimes reduced amplitude.
Purpose of the Study:
- To investigate if longer illness duration in schizophrenia correlates with reduced P300 amplitude and delayed latency.
- To determine if these P300 changes are consistent with a neurodegenerative process.
Main Methods:
- P300 amplitude and latency were measured in response to auditory target stimuli in 35 men with schizophrenia and 26 control men.
- Regression analysis was used to assess the impact of age, age of onset, and illness duration on P300 measures.
Main Results:
- P300 amplitude did not decrease with age in either group. In schizophrenic participants, amplitude positively correlated with age of onset and negatively with illness duration.
- P300 latency increased with age in both groups, but the age-related increase was significantly steeper in schizophrenic participants.
- P300 latency positively correlated with illness duration in schizophrenia but not with age of onset.
Conclusions:
- Longer illness duration in schizophrenia is linked to reduced P300 amplitude and delayed latency, indicating a progressive pathophysiological process.
- Reduced P300 amplitude might serve as a biomarker for an early-onset form of schizophrenia.