Exploring the relationship between frequent cannabis use, belief updating under uncertainty and psychotic-like symptoms.

From the PDI subscales, cannabis users had a significantly higher conviction score (Mann Whitney U = 1543.5, p = 0.043), and had a tendency for a higher preoccupation score, which did not reach statistical significance (Mann Whitney U = 1532, p = 0.051). 3.2 Space task performance in cannabis-users vs non-cannabis users 3.2.1 Overall performance (score) The best-fitted model for mean score included participant and counterbalancing condition nested within level as random effects and group, level, total SPQ score, and total PDI score as fixed effects.

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