Figure 5.

Dominance of dark stimuli increases with contrast in human vision. a, The ratio of errors at detecting light versus dark stimuli (light/dark ratio of all errors) was strongly correlated with stimulus contrast at all visual eccentricities tested. The labels at the top report the eccentricity range (from left to right: 5–30°, 5–10°, 15–20°, and 20–30°), goodness of fit (R²) and probability that the correlation is because of chance. b, Same as a for light/dark ratio of missed targets. Regression lines only showed for significant correlations. c, Same as a for light/dark ratio of reaction time.