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Olfactory Functioning in First-Episode Psychosis.

Vidyulata Kamath1, Patricia Lasutschinkow1, Koko Ishizuka1

  • 1Department of Psychiatry and Behavioral Sciences, The Johns Hopkins University School of Medicine, Baltimore, MD.

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Summary
This summary is machine-generated.

Olfactory deficits are common in first-episode psychosis (FEP), particularly in schizophrenia patients, impacting odor identification and detection. These deficits correlate with negative symptoms and anhedonia in schizophrenia.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Sensory Science

Background:

  • Olfactory deficits are recognized in schizophrenia, but less is known about performance across the psychosis spectrum.
  • This study investigates odor identification, discrimination, and detection thresholds in first-episode psychosis (FEP).

Purpose of the Study:

  • To compare olfactory performance in FEP patients with healthy controls.
  • To examine olfactory profiles within FEP subgroups (schizophrenia, schizoaffective disorder, bipolar disorder, major depression with psychotic features).
  • To explore relationships between olfactory function, symptomology, and self-report measures.

Main Methods:

  • 97 FEP patients and 98 healthy adults underwent odor identification, discrimination, and detection threshold testing.
  • Measures included lyral and citralva odorants, anticipatory pleasure, anhedonia, and empathy.
  • Sex-stratified analyses and subgroup comparisons were conducted.

Main Results:

  • FEP patients exhibited poorer olfactory performance across all measures compared to controls.
  • Schizophrenia-associated psychosis patients showed deficits in odor identification, discrimination, and citralva detection.
  • In schizophrenia, olfactory disturbance correlated with negative symptoms, anhedonia, and reduced anticipatory pleasure.
  • Mood-associated psychosis patients performed similarly to controls, with sex-specific olfactory differences.

Conclusions:

  • Olfactory deficits in FEP are more widespread than previously thought, extending beyond odor identification.
  • Schizophrenia-related subgroups display more pronounced olfactory impairments.
  • Further research is needed to determine if olfactory dysfunction predicts schizophrenia risk.