Fig. 2.

Conditional accuracy functions. To compute the conditional accuracy function (CAF), all reaction times (RTs) for corresponding and noncorresponding trial types are rank-ordered separately and then partitioned into equal-sized bins representing the fastest to the slowest RTs. For each bin, an accuracy rate is calculated and plotted against the mean RT for that bin, creating a CAF that spans the entire distribution of reactions. The figure depicts the CAFs for corresponding and noncorresponding trial types in Tourette syndrome and control groups. As expected, errors were predominantly associated with the fastest RTs (i.e., the fastest RT bin) on noncorresponding trials, confirming that participants were susceptible to capture by the incorrect motor urge. The Tourette syndrome and control groups showed similar patterns of fast errors, indicating that the strength of initial capture by the prepotent motor action was equivalent across groups.