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Olfactory identification deficiency and WCST performance in men with schizophrenia
1Cognitive and Neurobiological Psychopathology, Université Claude Bernard; Hôpital du Vinatier, Bron-Lyon, France.
Psychiatry Research
|December 19, 1998
Summary
Schizophrenia patients show deficits in spontaneous olfactory identification, linked to executive function impairments. Forced-choice olfactory tests did not reveal this association, suggesting different cognitive processes are involved.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- Olfactory identification deficits are common in schizophrenia, often assessed using the University of Pennsylvania Smell Identification Test (UPSIT).
- Previous research links olfactory identification to the orbitofrontal cortex and executive functions to the dorsolateral prefrontal cortex.
Purpose of the Study:
- To investigate the relationship between olfactory identification and executive functions in male patients with schizophrenia.
- To compare olfactory performance under spontaneous versus forced-choice identification conditions.
Main Methods:
- Assessed 24 male patients with schizophrenia and 21 male controls.
- Used spontaneous and forced-choice olfactory identification tests.
- Administered the Wisconsin Card Sorting Test (WCST) for executive function assessment.
Main Results:
- Schizophrenia patients smoked more, had lower spontaneous olfactory scores, and more perseverative errors on the WCST compared to controls.
- A significant relationship was found between spontaneous olfactory performance and WCST performance.
- Forced-choice olfactory identification scores did not correlate with WCST performance.
Conclusions:
- Spontaneous olfactory identification, unlike forced-choice, is associated with executive functions in schizophrenia.
- These findings suggest distinct neural pathways for different olfactory assessment methods and their link to cognitive deficits.