Olfactory hallucinations in a population-based sample

Area of Science:

• Neuroscience
• Psychiatry
• Epidemiology

Background:

• Olfactory hallucinations (OH) are perceptions without stimuli.
• Prevalence and triggers in the general population are understudied.
• Factors like substance use, life events, and mood are potential influences.

Purpose of the Study:

• To determine the prevalence of OH in a Norwegian general population sample.
• To investigate associated factors including demographics, mood, and life events.
• To explore co-occurrence with hallucinations in other sensory modalities.

Main Methods:

• Cross-sectional study analyzing self-report data from 2500 Norwegians (aged 18-96).
• Assessed occurrence of OH, other hallucinations, age, sex, depression/anxiety symptoms, mental health status, and severe life events.
• Statistical analyses were performed to identify significant associations.

Main Results:

• 4.2% reported experiencing OH (95% CI 3.5-5.1%).
• OH frequently co-occurred with other hallucinations (56%).
• Prevalence was higher in younger individuals and females. Anxiety symptoms and severe life events were significantly associated with OH.

Conclusions:

• OH affect a notable portion of the general population, often co-occurring with other hallucinatory experiences.
• Demographic factors (age, sex) and psychological factors (anxiety, stress) are linked to OH.
• Further research with comprehensive assessments is needed to understand OH and their impact on mental health.