Auditory false perceptions are mediated by psychosis risk factors

Area of Science:

• Psychology
• Neuroscience
• Psychiatry

Background:

• Auditory hallucinations are present in psychotic disorders and the general population.
• Positive schizotypy, a trait related to psychosis, predicts false perceptions in auditory tasks.
• Age and sex are significant demographic factors in psychosis.

Purpose of the Study:

• To replicate the finding that positive schizotypy predicts false auditory perceptions.
• To investigate the influence of age and sex on this relationship.
• To explore the link between schizotypy, signal detection, and hallucination proneness.

Main Methods:

• 76 healthy volunteers participated, divided into adolescent (15-17 years) and adult (19+ years) groups.
• Participants completed an auditory signal detection task to assess false perception propensity.
• Measures included the Unusual Experiences subscale of the O-LIFE schizotypy scale, IQ, and working memory.

Main Results:

• The association between high positive schizotypy and increased false perceptions was replicated.
• Younger participants (15-17 years) with high positive schizotypy reported significantly more false perceptions (p=.04).
• Older participants who reported past imaginary friends showed more false perceptions (p<.01).

Conclusions:

• Younger individuals with positive schizotypal traits exhibit a greater vulnerability to signal detection deficits.
• This deficit may underlie auditory hallucinations and suggests schizotypy's impact is greatest near psychosis onset.
• Findings highlight the role of schizotypy in predicting perceptual abnormalities, particularly in younger populations.