On each of 24 trials, participants saw a brief video clip of a person speaking.
The target action was replayed if the child was distracted and missed the video clip.
After seeing the video clip, each participant was required to produce four texts in randomly balanced order.
Parents were subsequently asked to correctly identify each of the four conditions by viewing each video clip twice.
Each emotion group is introduced and demonstrated by a short video clip giving some clues for later analysis of the emotions in this group.
The other half were asked to wait until each video clip had finished and then to describe what had happened (the video stopped condition).
Each trigger, then, is not pre-programmed with a particular video clip, but selects one of a number of possible clips.
After each video clip, participants were asked questions about their understanding of the interaction.
