Does cannabis use predict psychometric schizotypy via aberrant salience?

Area of Science:

• Neuroscience
• Psychiatry
• Psychology

Background:

• Cannabis use can trigger psychosis in healthy individuals and worsen schizophrenia symptoms.
• Dopamine dysregulation and aberrant salience are implicated in psychotic symptoms.

Purpose of the Study:

• To investigate the association between cannabis use, self-reported salience dysfunction, and schizotypal symptoms in a non-clinical population.
• To determine if aberrant salience mediates the relationship between cannabis use and schizotypal traits.

Main Methods:

• A cross-sectional study involving 910 university students.
• Utilized questionnaires including the Cannabis Experience Questionnaire (CEQmv), Schizotypal Personality Questionnaire (SPQ), Community Assessment of Psychic Experience (CAPE), and Aberrant Salience Inventory (ASI).
• Mediation analysis was employed to test the role of aberrant salience.

Main Results:

• Frequent cannabis consumption and higher ASI scores predicted increased positive and disorganized schizotypal symptoms.
• Aberrant salience mediated the relationship between cannabis use and several SPQ subscales, including 'ideas of reference', 'odd beliefs', and 'unusual perceptual experiences'.
• Cannabis use was associated with increased psychometric schizotypy and aberrant salience.

Conclusions:

• Cannabis use is associated with heightened schizotypal traits and aberrant salience in a non-clinical student population.
• Disturbances in salience processing partially explain the link between cannabis use and positive/disorganized schizotypal symptoms.
• Findings suggest a potential mechanism linking cannabis use to psychosis-like experiences via altered salience attribution.