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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Psychol Rev. 2017 Nov 16;125(2):183–217. doi: 10.1037/rev0000085

Figure 2.

Figure 2

A illustrates the diffusion decision model. B shows the additional components of the decision model that produce the total RT. C shows the standard assumption about drift rate and its variability across trials. D shows equations for drift rates and across trial SD in drift rate for the two ANS-diffusion models.