Human free-operant performance varies with a concurrent task: Probability learning without a task, and schedule-consistent with a task.

This analysis revealed that there was only a marginally significant main effect of group, F (1, 38) = 3.85, p = .057, η p 2 = .092, 95% CI [.000, .282], p(H 1 /D) = .522, a significant main effect of schedule, F (2, 76) = 18.71, p < .001, η p 2 = .330, [.155, .461], p(H 1 /D) = .987, and a significant interaction between the two factors, F (2, 76) = 7.71, p < .001, η p 2 = .169, [.034, .308], p(H 1 /D) = .502.

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