Figure 4.
Participants committed spontaneous errors at low RT. A, Initial directional error as a function of RT in the Forced RT (gray) and Free RT (green) conditions for a representative participant. B, The probability of an error for each trial was predicted based on the estimated distribution of TP for that participant and the known RT for that trial. C, Comparison of actual error rate (total number of errors divided by total number of trials) versus predicted error rate (based on the average probability of an error in each trial, computed as shown in B).