Why Do Some People Without Mental Health Problems Experience Hallucinations? Replication Study Casts Doubt On Previous Theories

Hallucinations are a common symptom of schizophrenia and related disorders, but mentally well people experience them, too. In fact, work suggests that 6-7% of the general population hear voices that don’t exist. However, exactly what predisposes well people to experience them has not been clear. Now a major new study of 1,394 people native to 46 different countries provides support for two hypotheses from earlier, smaller studies — namely, that a history of childhood trauma and a propensity to hear non-existent speech among background noise are both associated with experiencing hallucinations — but does not support three others. 

“In terms of reproducibility, these results may be a cause for concern in hallucinations research (and cognitive and clinical psychology more broadly),” writes the team in their paper in Psychological Science. In firming up a few ideas, the work does, though, help to clarify what aspects of cognition as well as past experience are — and are not — linked to being more prone to hallucinations. Continue reading →

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