3.1.2. Materials

As in experiment 1, participants were asked to communicate about a set of events shown in vignettes selected from the stimuli used by Abner et al. (2019). A total of 32 vignettes were selected5, showing 16 unique items used in typical and atypical contexts. We also manipulated the iterability of the vignettes: half of the items were typically used in an iterable manner, where the action is repeated (e.g., *rocking the baby*); half were typically used in a non-iterable manner (e.g., *putting on a backpack*). The experiment took place in a private room and ran on an Apple Macbook Pro laptop using Microsoft Powerpoint. All vignettes were presented in a randomized order. Video recording was done using a Canon Vixia HF R800 camcorder mounted on a tripod. Participants were seated in the room with the laptop on a table beside them, facing the camera during the improvisation stage and facing their partner during the interaction stage.
