Figure 1.

Representative pupil traces from 5 s to 15 s with the S-cone (blue line) and melanopsin (brown line) modulations (16% Michelson contrast, 3.3 log Td) recorded during the same session from one subject (S3) after removing the steady pupil size (∼3 mm). A sinusoidal trace in the same phase but an arbitrary amplitude as the stimulation is included for reference purposes (light gray line). Steady pupil size (averaged across subjects) for the five light levels is included in the inset. Traces are filtered minimizing components below 0.5 Hz and higher than 1.5 Hz.