FIGURE 5.

Rmcorr plots of repeated-measures correlations between 10-min Psychomotor Vigilance Test (PVT-10) and 3-min Psychomotor Vigilance Test (PVT-3) response speed (1/RT) by study day for Condition A (A) and Condition B (B). Each color represents a distinct participant with each point showing performance on both measures at one time point while the corresponding line shows the rmcorr fit for that participant (Bakdash and Marusich, 2020; R Core Team, 2020). The gray dashed line represents the regression line obtained by ignoring repeated measurements and treating the data as independent observations; r_rm represents the common within-individual association (rmcorr). Rmcorr effect sizes were interpreted as follows: 0.00–0.29, negligible; 0.30–0.49, weak; 0.50–0.69, moderate; 0.70–0.89, strong; and 0.90–1.00, very strong. Included time points for each day were as follows: baseline day 2 (B2) from 1000 to 2200 h; sleep restriction day 5 (SR5) from 0800 to 2000 h; total sleep deprivation (TSD) from 2200 to 2000 h; and recovery day 4 (R4) from 1000 to 2000 h.