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. 2013 Apr 15;9(4):353–362. doi: 10.5664/jcsm.2588

Figure 3. Visual Psychomotor Vigilance Task (VPVT) performance across three study days.

Figure 3

Performance on the visual psychomotor vigilance task (vPVT) at each time point relative to circadian phase plotted across baseline day and constant routine days 1 and 2. (A) vPVT mean reaction time (RT) in milliseconds; (B) Number of lapses on vPVT. Testing was carried out every 30°/∼120 minutes. For statistical analysis, data were assigned to 15° “bins” and the mean of all available trials occurring within each 45°/∼3-h WMZ or DAY block was then included. See legend of Figure 2 for additional information. *Post hoc analysis of Study day × Block interaction for vPVT mean RT. Constant Routine Day 1: p = 0.008, Partial h2 = 0.23. Constant Routine Day 2: p = 0.005, Partial h2 = 0.26. +Main effect of Block comparison, without interaction effect, p < 0.0001, Partial h2 = 0.49.