Figure 1. Stimuli example.

Example of stimuli used to estimate M-cone phase lags. An equichromatic flickering 656 nm light was superimposed on a pair of sinusoidally alternating L-cone-equated 656 and 540 nm lights that generate an M-cone flicker signal, and all three targets were superimposed on the intense 658 nm background. Phase lags were measured between the equichromatic flicker and the M-cone flicker.