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Abnormal peripheral auditory asymmetry in schizophrenia.
E Veuillet1, N Georgieff, B Philibert
1UMR CNRS 5020, Neurosciences et Systèmes Sensoriels, Hôpital Edouard Herriot, Pavillon U, 3 Place d'Arsonval, 69437 Lyon Cedex 03, France. evelyne.veuillet@chu-lyon.fr
Journal of Neurology, Neurosurgery, and Psychiatry
|December 16, 2000
Summary
Schizophrenia patients show altered peripheral auditory function, specifically in otoacoustic emissions and medial olivocochlear system asymmetry. This lack of right ear advantage may reflect central auditory processing abnormalities.
Area of Science:
- Neuroscience
- Audiology
- Psychiatry
Background:
- Auditory processing difficulties are common in schizophrenia.
- Early auditory filtering disturbances may link to temporal lobe abnormalities.
Purpose of the Study:
- To investigate peripheral auditory function in schizophrenia patients.
- To explore otoacoustic emissions and medial olivocochlear system functioning.
Main Methods:
- Otoacoustic emissions (click-evoked, spontaneous) and medial olivocochlear efferent system function measured.
- 12 chronic schizophrenic patients compared to 12 healthy controls.
Main Results:
- Similar otoacoustic emission amplitudes and overall medial olivocochlear functioning between groups.
- Schizophrenic patients showed differences in otoacoustic emission intensity and medial olivocochlear asymmetry.
- Schizophrenic patients exhibited a right ear advantage for click-evoked otoacoustic emission amplitude, unlike controls.
Conclusions:
- Disturbed peripheral auditory lateralization in schizophrenia observed, even without attention tasks.
- Lack of right ear advantage in medial olivocochlear functioning suggests peripheral reflection of central anomalies.