All participants are tested in a lab room at the German Sport University Cologne. There are two identical work spaces. Each work space is made up of a desk with a computer, a screen, a keyboard, and a mouse. Additionally, for some of the tests we used a chin rest. The chin rest is adjustable in height and has a headband. Participants have a distance of 50 cm from the screen when the chin rest is used. The two work spaces are seperated by a room divider, so participants cannot see each other. There is an additionally desk for the experimenter in the lab. It is placed in a way that the participants cannot see the experimenter, even not in the reflection of their screen. Computer: - Type: Esprimo 710 (Advanced) - Processor: Core i3-3220 (3.30 GHz) - Memory: 4 GB - Hard disk: HDD SATA III 500 GB 7.2k Screen: - Type: Dell Professional P2412H - Size: 24" - Maximum resolution: 1920 x 1080 - Brightness: 250 cd/m2 - Contrast: 1000:1 /2000000:1 (dynamic) - Refresh rate: 60 Hz - Speed: 5 ms