Figure 1.

Basic model framework. Accumulators begin each trial with some pre-set level of activity, A. Following stimulus onset, accumulators begin to rise towards a threshold level of activity that acts as a decision trigger, b. When the threshold is lowered, responses are generally faster, but more prone to error. When raised, responses tend to be slower, but have the benefit of more samples of information. The rate at which information accumulates depends on the quality of the sensory evidence; when stimuli are identical, this drift rate, v should be constant on average, though intra- and inter-trial variability are allowed in several model variations. Here and throughout this work, green traces correspond to a speed stress (fast) condition, and red traces correspond to an accuracy stress (accurate) condition.