These data were reported by Thibault et al (2007) (their Figure 4) and provide developmental data on the contrast modulation threshold for detection of a moving stimulus for two kinds of motion, called First-order (or luminance based) and Second-order (contrast based).
data(Motion)A data frame with 112 observations on the following 5 variables.
Subjecta factor with levels S01,S02, ..., S70 coding the id of each observer
LnAgea numeric vector giving the natural log of age in months
Mtypea factor with levels FO SO coding the type of stimulus, first-order or second-order
Sexa factor with levels f m indicating the sex of the observer
LnThresha numeric vector giving the natural log of the percent contrast modulation threshold
The data were collected using preferential-looking techniques. Percent contrast varies between 0 and 100.
Thibault, D., Brosseau-Lachaine, O., Faubert, J. and Vital-Durand, F. (2007) Maturation of the sensitivity for luminance and contrast modulated patterns during development of normal and pathological human children. Vision Research, 47, 1561--1569