Figure 5.

A comparison of developmental time courses for eight visual functions: a, Spatial resolution, as in Figure 2. b, Vernier acuity, a fine positional acuity that develops over a similar profile to spatial resolution but over a longer time course and improves on the order of a factor of ∼100. c, Peak spatial contrast sensitivity. d, Peak temporal modulation sensitivity. e, Sensitivity to global motion measured with random dot kinematograms. f, Sensitivity to global form measured with Glass patterns. g, Sensitivity to complex pattern motion measured with a plaid direction discrimination task. h, Contour integration ability measured as a figure-background discrimination. All eight visual functions illustrated here were measured using the same psychophysical task; the exact time course could be different depending on task and stimulus choice. The panels are ordered from top to bottom by age of onset of the visual ability. Smooth curves indicate Naka-Rushton functions illustrating the developmental profiles. Inverted triangles represent the age at which the function reaches one-half its asymptotic level, which is a metric for relative age at maturation. a, c, d, Data are redrawn from Stavros and Kiorpes (2008). b, Data are redrawn from Kiorpes (2015). e, f, Data are from Kiorpes et al. (2012). g, Data are from Hall-Haro and Kiorpes (2008). h, Data are from Kiorpes and Bassin (2003).