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Related Experiment Videos

Olfactory deficits in schizophrenia are not a function of task complexity

L Kopala1, K Good, J Martzke

  • 1Department of Psychiatry, University of British Columbia, Vancouver, Canada.

Schizophrenia Research
|October 1, 1995
PubMed
Summary

Schizophrenia patients show olfactory deficits, but not on tasks like color identification. This suggests smell identification issues stem from brain abnormalities, not task difficulty.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Sensory Processing

Background:

  • Olfactory identification deficits are common in schizophrenia.
  • Previous research indicated male schizophrenia patients are particularly impaired on smell identification tests.

Purpose of the Study:

  • To investigate if olfactory deficits in schizophrenia patients are linked to task complexity.
  • To assess if male schizophrenia patients exhibit similar deficits on a color identification task.

Main Methods:

  • Sixty-five medicated schizophrenia patients and 30 controls completed the University of Pennsylvania Smell Identification Test (UPSIT) and the Colour Identification Test (CIT).
  • Scores on both UPSIT and CIT were analyzed to compare performance between groups.

Main Results:

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  • Schizophrenia patients scored significantly lower on the UPSIT compared to controls.
  • No significant difference in CIT scores was found between schizophrenia patients and controls.
  • Male schizophrenia patients showed olfactory deficits but performed similarly to others on the CIT.
  • Microsmic schizophrenia patients performed comparably to controls on the CIT.

Conclusions:

  • Olfactory identification deficits in schizophrenia are likely due to abnormalities in olfactory brain pathways, not task complexity.
  • Task complexity does not appear to be a confounding factor for smell identification deficits in schizophrenia.