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The right-ear advantage in schizophrenia

V Shukla1, P B Behere, M K Mandal

  • 1Banaras Hindu University, India.

The British Journal of Clinical Psychology
|May 1, 1993
PubMed
Summary

Schizophrenia patients show altered auditory processing, with a normalized right-ear advantage appearing as their acute illness subsides. This suggests a dynamic change in brain function related to symptom severity.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Auditory Processing

Background:

  • Auditory processing, particularly verbal dichotic listening, is often impaired in schizophrenia.
  • The right-ear advantage (REA) in dichotic listening is a common indicator of left-hemisphere language dominance.

Purpose of the Study:

  • To investigate changes in verbal dichotic listening performance in schizophrenic patients over time.
  • To compare auditory processing in schizophrenics, patients with affective disorder, and normal controls.

Main Methods:

  • A verbal dichotic listening task was administered to three groups: schizophrenics, affective disorder patients, and normal controls.
  • Testing occurred at three time points: 0-2 weeks (acute phase), 4-6 weeks, and 14-16 weeks (remission).

Main Results:

  • Schizophrenic patients exhibited a non-significant ear difference during the acute phase (0-2 weeks).
  • The typical right-ear advantage (REA) in dichotic listening re-emerged in schizophrenics as their acute illness subsided (14-16 weeks).
  • Patients with affective disorder and normal controls showed consistent REA throughout the study periods (data not shown in abstract).

Conclusions:

  • Auditory processing deficits in schizophrenia, specifically the absence of REA, are linked to the acute phase of the illness.
  • The normalization of REA as symptoms remit suggests that these auditory processing changes are state-dependent and potentially reversible.

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