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Experimental design. The experiment lasted for over 3 hours. It was divided into 3 equal blocks by short breaks of about 5 - 10 minutes. Every block was further subdivided into 3 equal sub-blocks (sbl). In each sub-block participants had to perform a Simon task which is shown in the lower left corner. Before and after the Simon task participants had to judge their current mental fatigue and motivation to continue with the task on rating scales.
