Figure 1

Stimuli Creation Procedure. The stimuli creation procedure was based on previous work^{32,37,48,49,50,51,52,53}, and respected requirements of experimental control for dance stimulus materials^31,54. Choreography of the 30 sequences (of Western contemporary and ballet dance) took place prior to the recording session and was led entirely by the dancer in conversation with two of the authors with professional dance experience (JFC and LSE). Filming of the dance sequences took place at the Max-Planck-Institute for Empirical Aesthetics in Frankfurt/M. For filming, a Canon EOS 5D Mark IV camera was used, with a Canon EF 24–105 mm f/4 L IS USM lens (settings: e.g., framerate (raw) at 50fps and framerate (output) at 25 fps. White balance: 5000 k, shutter speed: 1/100 s, and ISO: 400. The video format: H.264, aspect ratio: 16:9, and resolution: 1920 × 1080). A standard 6 × 3 m chroma-key greenscreen background was used to allow for the creation of additional visual preparations of the stimuli, such as silhouette videos and blurred faces. For this, dedo-stage lights (7 dedo heads, dimmers and stands kit) were required to illuminate the entire greenscreen and to minimise shadows. Postproduction was done using Adobe After Effects 2019 and Adobe Premiere Pro 2019. All footage was trimmed to the exact start and end points of the movements. Each clip was rendered into a separate file in an uncompressed format and the title was added, as specified verbally by the dancer during the recording. Before saving, the sound tracks (speech and ambience noise) of the clips were removed. Using Adobe After Effects, “Keylight” effect was added to all files, and the background removed from each clip. The “Level” effect (setting: output black = 255) was further applied to each clip to colour the extracted foregrounds white (the visible dancer silhouette). “Opacity” keyframes were then added to the beginning and the end of each clip to allow for a fade-in and fade-out of each clip (8 frames). Finally, each clip was rendered as a separate file in H264 format. The dancer was Ms Anne Jung and her informed consent for publication of identifying information, images and film in an online open-access publication were obtained. A short video of the creation process is available here: https://www.youtube.com/watch?v=Eij40jtw8WE.