Olfactory identification and preference in bipolar disorder and schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Sensory Science

Background:

• Olfactory identification deficits are a known feature of schizophrenia.
• It remains unclear if these deficits are specific to schizophrenia or common in psychotic disorders.

Purpose of the Study:

• To compare olfactory identification and preference in schizophrenia and bipolar disorder.
• To investigate the relationship between olfactory function, clinical symptoms, and social competence.

Main Methods:

• Utilized the University of Pennsylvania Smell Identification Test (UPSIT) for olfactory identification.
• Assessed olfactory preference using a 5-point rating scale post-identification.
• Included clinical symptom and social competence assessments.

Main Results:

• Both schizophrenia and bipolar disorder groups demonstrated olfactory identification deficits compared to controls.
• Schizophrenia patients showed more significant impairment on UPSIT accuracy than bipolar patients.
• Both patient groups rated odors as more pleasant than controls, with preference linked to correct identification.

Conclusions:

• Olfactory identification and preference are compromised in both schizophrenia and bipolar disorder.
• The specific nature of these olfactory abnormalities requires further investigation.
• Social competence correlates with better olfactory identification performance.