Increase of subjective fatigue over time.

Experiment 1. Participants’ subjective fatigue levels increased over the course of each experimental session when receiving placebo stimulation. This increase in subjective fatigue was prevented by anodal stimulation to the right dorsolateral prefrontal cortex (mixed ANOVA interaction brain stimulation * subjective fatigue high regulatory control: p = .007, partial η2 = .14; low regulatory control: p = .013, partial η2 = .124). t1: before phase I, t2: between phase I and phase II, t3: after phase II. n.s.: not significant (p>.05).