Figure 1.

Probabilistic stop task and LBA model. A, Each trial started with a cue indicating the probability that a stop signal would be presented. The cue was followed by a house or face stimulus, indicating a left (right-hand index finger) or right (right-hand middle finger) response. During stop trials, a tone was played at some delay (SSD) after the presentation of the go stimulus. The tone instructed participants to suppress the indicated response. The likelihood of a stop signal presentation was 25% in the low, 50% in the high, and 0% in the none cue blocks. B, The LBA model was used to examine strategic adjustments during go trials with increasing stop signal likelihood. Model selection was performed to identify the best model for representing the observed RT distributions (lowest BIC).