Cannabis Use, Schizotypy and Kamin Blocking Performance

Area of Science:

• Neuroscience
• Psychology
• Psychopharmacology

Background:

• Cannabis use is linked to psychosis risk, potentially via altered salience attribution.
• Psychosis-proneness, particularly schizotypy, is associated with learning deficits in salience allocation.

Purpose of the Study:

• To investigate the relationship between cannabis use history and Kamin blocking (KB), a measure of selective associative learning.
• To examine KB in relation to schizotypy and aberrant salience in a non-clinical sample.

Main Methods:

• A cross-sectional study of 307 healthy participants using the Testable Minds platform.
• Kamin blocking (KB) assessed via Oades' "mouse in the house task".
• Schizotypy measured by the Schizotypal Personality Questionnaire (SPQ) and aberrant salience by the Aberrant Salience Inventory (ASI).

Main Results:

• Neither lifetime nor current cannabis use significantly altered KB scores.
• Current cannabis use was associated with higher Disorganised SPQ scores and ASI values.
• A positive association was found between KB and Disorganised SPQ scores; "Senses Sharpening" ASI predicted decreased KB in non-recent cannabis users.

Conclusions:

• Cannabis use did not directly impair Kamin blocking in this healthy cohort.
• Cannabis use is linked to increased aberrant salience and disorganized schizotypal traits.
• Findings highlight complex interactions between cannabis, salience, and schizotypy, with potential moderating effects of recent use.