Fig. 2

The difference in mutual information between different adaptation conditions. a Distribution of mutual information difference between high- and low-contrast conditions during the late or steady-state period (between-condition comparisons). Black: gratings had a high mean luminance (HiL); grey: gratings had a low mean luminance (LoL). b As in (a), but showing the distribution of ∆ MI between high- and low-luminance conditions, for gratings with a high and low contrast. Black: gratings had a high contrast (HiC); grey: gratings had a low contrast (LoC). c–f Distribution of mutual information difference between early and late phases of adaptation for every luminance–contrast condition (within-condition comparisons). The solid lines indicate upward switches (e.g., low- to high-luminance switch in (c)); dashed lines indicate downward switches (e.g., high to low luminance in (e)). The inset in (c) demonstrates the colour code for luminance and contrast switches (e.g., dark blue indicates contrast increments when the gratings had a low mean luminance). Small triangles indicate the average mean of the distribution; asterisks indicate significance (p < 0.01, t test). n = 390