We have recently developed a Presentation version of the MRKT (Motorische Reaktie-Keuze Test). In this experiment a button box with 6 buttons is used (one base button and 5 buttons which can be lighted). The subject has to keep a base button pressed. When one of the 5 other buttons light up, the subject has to release the base button and press the lighted button. Both the release time of the base button and the reaction time for the target button are measured. The experiment also reports whether you have pressed the correct button or not.