Emergence of post-error slowing with training.

<p>A) Post-error slowing shown using the error response function (ERN) for 6 trials after an error and each training day. Data are shown as one-sample t-tests across subjects. B) Mean and standard error ERN across subjects for the first (Day 1), middle (Day 5) and last (Day 10) day of training. Each value shows the average response time, in milliseconds, at six different lags relative to the block mean value for that day. C) Same as <i>A</i> for responses during the Random probe block. D) Same as <i>B</i>, but for Random probe block trials.