What percentage experience psychosis-like experiences in the general population, and what is their predictive value for delusions?

• A. 2% experience psychosis-like experiences; no relation to delusions
• B. 12% experience psychosis-like experiences; hallucinations predict delusions
• C. 0.5% experience psychosis-like experiences; only mood symptoms
• D. 7% experience psychosis-like experiences; hallucinations predict delusions

Answer: (D)

Psychosis-like experiences are relatively common in the general population. Population-based studies show that roughly seven percent of people report at least one such experience, like a perceptual odd sensation or a brief hallucination, even though they don’t meet criteria for a psychotic disorder. Most of these experiences are transient and do not indicate an illness, but they do signal increased vulnerability to later psychosis-spectrum symptoms.

The part that’s most informative for predicting delusions is the type of experience. When hallucination-like experiences are present, the risk of developing delusional beliefs later on is higher than with other kinds of psychosis-like experiences or with mood symptoms alone. In other words, hallucinations among psychosis-like experiences are more strongly linked to future delusions, even though progression is not guaranteed.