Fig 5. Time of day predicting the intercept, linear, and quadratic coefficients for within task fatigue.

Notes: Sample 1 is red, Sample 2 is blue. Shaded regions represent 95% confidence intervals. Plots reveal that (A) there is a daily pattern for session score at the beginning of the session (Intercept term) but no significant or consistent pattern for either the (B) linear or (C) quadratic terms defining within-session fatigue.