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. Author manuscript; available in PMC: 2018 Apr 1.
Published in final edited form as: J Math Psychol. 2016 Nov 9;77:94–110. doi: 10.1016/j.jmp.2016.10.001

Figure 1.

Figure 1

Illustration of the key ideas for computation of FPT properties of the multistage model with piecewise constant drift and thresholds. The distribution of evidence x(ti) conditioned on no decision until ti serves as the distribution of initial condition for the i-th stage process. If threshold ζi+1 < ζi, then probability of instantaneous decision at time ti is computed as the probability of x(ti) conditioned on no decision until ti not belonging to the set (−ζi, ζi). If threshold ζi+1 > ζi, then there is no instantaneous decision and only the support of x(ti) conditioned on no decision until ti is increased to (−ζi+1, ζi+1).