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Affectively salient meaning in random noise: a task sensitive to psychosis liability
Mariana Galdos1, Claudia Simons, Aranzazu Fernandez-Rivas
1Department of Psychiatry and Neuropsychology, South Limburg Mental Health Research and Teaching Network, Maastricht, the Netherlands.
Schizophrenia Bulletin
|April 3, 2010
Summary
Individuals with psychosis are more prone to perceiving meaningful speech in white noise. This "speech illusion" task may help identify psychosis vulnerability and is linked to positive schizotypy.
Area of Science:
- Psychiatry
- Cognitive Neuroscience
- Genetics
Background:
- Stable attribution of meaning and emotional value to experiences can indicate psychosis liability.
- Detecting meaningful speech in neutral signals (speech illusion) may be a marker for this liability.
Purpose of the Study:
- To assess speech illusion variation in individuals with psychosis, their siblings, and controls.
- To determine the association between speech illusion and psychometric/familial psychosis vulnerability.
Main Methods:
- A white noise task was used to measure speech illusion detection.
- Participants included 30 patients, 28 siblings, and 307 controls.
- Speech illusion rates were compared across groups and correlated with schizotypy measures.
Main Results:
- Patients showed higher rates of speech illusion than controls (OR=4.0, 95% CI=1.4-11.7).
- This difference was more pronounced for affectively salient illusions.
- Speech illusion correlated with positive schizotypy and increased with familial psychosis risk.
Conclusions:
- The white noise task may detect psychosis vulnerability linked to altered top-down processing or salience attribution.
- Speech illusion is associated with familial risk and positive schizotypy, suggesting its potential as a biomarker.
