Figure 3.

Movement traces on no-stop (A) and stop trials (subdivided into noncancelled, B; and canceled, C; subtypes). Traces are drawn until the point of maximum deviation toward the target. Stop trials are color-coded by SSD. SSD histograms represent the proportion of times a given SSD was sampled. A, On no-stop trails, movement amplitudes are ∼0.2 m (tilted histograms on the right). B, Movement amplitudes on noncanceled trials varied considerably. Earlier stop signals are accompanied with earlier but smaller movements, as represented by the histograms. C, When the movement was successfully canceled, amplitudes are typically <0.01 m.