Figure 7.

(A) Associations between visual search reaction time and illuminance (log lx). Linear regression fits between reaction time (median for all presentations in an iteration of the task) and illuminance for each participant record, with the distribution of slopes for fit lines shown in boxplots (box shows median ± IQR, whiskers extend to 1.5 × IQR with outliers as closed circles) to the right. (B,C) Associations between time of day and (B) psychomotor vigilance task (PVT) reaction times (ms) and (C) visual search reaction times (ms). Scatter plots showing the distribution of visual search reaction times across all participant records as a function of time of day. The red lines show the harmonic fit (see Section 2), with horizontal blue line indicating mesor and vertical blue line showing the time of nadir.