Figure 2.

Illustration of the DDM as applied to the reference-back task. Within a trial, the evidence about whether the probe stimulus matches the WM referent is accumulated with mean drift rate v until a response threshold is reached, triggering the corresponding response (at the time labeled ‘response onset’). Response time is the time it takes to reach a threshold (decision time) plus an intercept term representing non-decision time processes that occur outside of the decision stage.