Figure 10.

(A) Time-course of normalized t² functions for young and old subjects. Each subplot shows mean time-courses, across young subjects (<30 years old), at each luminance level, and across old subjects (>60 years old) in the two conditions with the highest luminance: condition 1 (c1) plotted in black and condition 9 (c9) plotted in gray. (B1,C1) Confidence intervals of young and old t² functions. Each subplot shows the time-course of 95% confidence intervals of the mean t² functions of young subjects (in gray) at each luminance level and of old subjects (in green) in the first brightest condition (luminance = 60.8 cd/m²). (B2,C2) Overlaps between young and old t² functions. Each subplot depicts the area under the t² function of young (<30) and old (>60) subjects shaded in dark green. The edges of the young t² functions are black, those of old t² functions are red. The overlap between t² functions for young and old subjects is shaded in light green. The proportion of overlap is given inside each subplot and the luminances are given in the title of each subplot.