Figure 1.

Stimuli for behavioral and fMRI experiment. (A) After watching short movies, non-professional speakers retold the narratives on video. 24 stories were combined into 12 video clips (9 min each). (B) Session design: Participants underwent 2 sessions per experiment. In one session, 3 video clips were presented. Each video clip was preceded by a task description and followed by a corresponding control question. For the behavioral part participants pressed a button according to the task. During the fMRI part they attended to the task (without pressing a button). For the CON task participants attended to conventional aspects in co-speech gestures, such as the expression of the relevance of a topic (compare “pragmatic gestures,” e.g., Payrati and Teßendorf, 2014) as indicated in the left still frame, or a depiction of a stepwise process (compare “image schemas in gestures,” e.g., Mittelberg, 2013a) as displayed in the right still frame. For visualization purposes the complete hand movement is indicated here by motion capture trajectories (blue lines). The trajectories were not displayed during the experiments. Written consent was obtained from the participants for publication of this image.