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A. Evolution of the decision variable in a sequential-sampling model of a left-right visual motion judgment, both in the absence of noise (straight trajectory labeled “Drift Rate”) and with the addition of noise (remaining trajectories). Adapted from Ratcliff & McKoon, 2008, p. 876). B. Evolution of the log posterior ratio in the present model, as applied to a forced choice between outcomes with values as shown at right, both with and without noise (random utility)
