Motion {MPDiR}

Threshold for First- and Second-order Movement with Age

Description

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).

Usage

data(Motion)

Format

A data frame with 112 observations on the following 5 variables.

Subject

a factor with levels S01,S02, ..., S70 coding the id of each observer

LnAge

a numeric vector giving the natural log of age in months

Mtype

a factor with levels FO SO coding the type of stimulus, first-order or second-order

Sex

a factor with levels f m indicating the sex of the observer

LnThresh

a numeric vector giving the natural log of the percent contrast modulation threshold

Details

The data were collected using preferential-looking techniques. Percent contrast varies between 0 and 100.

Source

Data kindly provided by F. Vital-Durand.

References

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

Examples

data(Motion)