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. 2021 Jan 8;11:588253. doi: 10.3389/fpsyg.2020.588253

FIGURE 2.

FIGURE 2

Time course of subjective feeling of mental fatigue. ** and ***: Significantly different from Pre (p < 0.01 and p < 0.001, respectively). $$: Significantly different from the previous measurement (p < 0.01). Data are presented as mean ± SE.