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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: Cogn Psychol. 2011 Oct 1;63(4):210–238. doi: 10.1016/j.cogpsych.2011.08.001

Figure 2.

Figure 2

Schematic of the standard diffusion model. Noisy evidence accumulates over time from the starting point, z, to one of two boundaries, a or 0. The total response time includes the decision time plus the time taken for nondecision processes like visual encoding (i.e., ter).