Fig 1. Examples of the 6 face prototypes each showing one of the 6 emotional expressions at each intensity.

From left to right: age 5–8 female happy, age 5–8 male disgusted, age 9–12 female angry, age 9–12 male afraid, adult female sad, adult male surprised. The top row contains the the more intense versions and the bottom row contains the less intense versions. It is not possible to identify any individual's face from the final prototypes, therefore we did not require permission to publish these images.