Figure 4. Certainty grows with stimulus strength for both correct and error responses.

A. The horizontal position of the saccade end points are averaged across all RTs for the correct (solid) and error (dashed) responses for each motion strength. Overall, subjects were less certain when they made errors, but five of the six subjects were more certain when those errors were made in response to stronger motion. Each panel shows the data from one subject (S1–S6). Error bars are s.e.m.