Fig. 2.

Property extension in Study 1. The proportion of trials in which participants extended the target property to individuals of the mentioned and unmentioned groups (a) is shown separately for each age and condition. Error bars and bands reflect 95% confidence intervals. Small shapes reflect individual averages, and large shapes and lines reflect group averages. In the Johnson-Neyman plots (b), lines reflect differences in simple slopes of condition predicting participants’ extension of the target property as a function of age and group membership. The age at which property extension became significantly different is marked by the dashed vertical line.