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Mismatch negativity in schizophrenia: a family study
Elvira Bramon1, Rodney J Croft, Colm McDonald
1Institute of Psychiatry, PO Box 63, De Crespigny Park, Denmark Hill, London SE5 8AF, UK. e.bramon@iop.kcl.ac.uk
Schizophrenia Research
|January 27, 2004
Summary
Mismatch negativity (MMN) is reduced in schizophrenia patients but not in unaffected relatives. This auditory evoked potential is not a reliable marker for genetic vulnerability to schizophrenia.
Area of Science:
- Neuroscience
- Psychiatry
- Genetics
Background:
- Mismatch negativity (MMN) measures auditory cortical activity in response to stimulus changes.
- MMN is explored as a potential genetic vulnerability marker for schizophrenia.
Purpose of the Study:
- To compare MMN amplitudes in schizophrenia patients, their unaffected relatives, and controls.
- To determine if MMN is a reliable endophenotype for schizophrenia.
Main Methods:
- Auditory MMN task performed by 25 schizophrenia patients, 37 unaffected relatives, and 20 controls.
- Linear regression with robust standard errors analyzed MMN amplitude differences, accounting for family correlations.
Main Results:
- Schizophrenia patients exhibited significantly smaller MMN amplitudes at FZ and F3 compared to relatives and controls.
- No significant differences in MMN amplitude were observed between unaffected relatives and controls.
- No strong evidence supported MMN amplitude as a familial trait.
Conclusions:
- MMN amplitude is confirmed to be reduced in schizophrenia.
- MMN does not demonstrate significant familial influence and is normal in unaffected relatives.
- MMN is an unreliable marker for schizophrenia vulnerability in subclinical populations and unlikely to be an endophenotype.