Appendix 1—figure 5. Switch-related pupil responses (both pupil area, top, and pupil area change rate, bottom) estimated while using three different methods for identifying perceptual switches.

Although the OKN-based method is the only one that is available in all conditions, the match with the other two methods (based on manual report, and based on on-screen events) is good in those conditions where those other methods apply. The only marked difference between methods is a temporal shift in the estimated pupil response curves, in agreement with the fact that on-screen switches happen first, followed a little later by a reversal in OKN direction, and yet later by a key press response.