For example
In a recent study, we asked children to play a picture-matching game. Children would see two pictures on a computer and they would say to an adult (the experimenter) what they need to do with the pictures in order to complete a poster. For every pair, children got a sticker.
Children’s productions were audio-recorded and later, we performed an analysis of the acoustic characteristics of their speech, like duration, pitch, and loudness, to infer what children know about the sound structure of complex words like “blueberry” or "colouring book.”