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Variable difficulty (η = 0.1) in the free response paradigm. Minimum MRT is achieved when all bias is accounted for by a shift in starting point z. Bias β = 0.8, boundary separation a = 0.12. Top panel: Parameter combinations of starting point as a ratio of boundary separation z/a and shift in drift rate criterion vc that lead to the same fixed level of accuracy (90% for v = 0.2, 95% for v = 0.3). Bottom panel: Mean RT that corresponds to the parameter combinations of the top panel.
