Characterizing a psychiatric symptom dimension related to deficits in goal-directed control.

In separate analyses using fits of the computational learning model (see Materials and methods; Supplementary file 5A ), all of the aforementioned results were recapitulated, with the exception that the relationship between OCD and model-based learning in Experiment 1 fell short of significance (but was significant in Experiment 2) and schizotypy reached significance in Experiment 2 as a negative predictor of model-based learning.

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The size of this effect was similar in Experiment 2, but with the benefit of an increased sample size was highly significant, indicating this was an issue of statistical power.

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