Results: 2

1.
Figure 1

Figure 1. Number of PVT lapses as a function of length of time awake. From: Classifying performance impairment in response to sleep loss using pattern recognition algorithms on single session testing.

Twelve subjects underwent a 50-hr sleep deprivation where the PVT was administered every 2 hours. The average number of PVT lapses (RT > 500 msec) were computed over the first, second and third 16 hours of wakefulness for each subject and then across subjects. The number of PVT lapses for each time awake bin is plotted as mean ± standard deviation.

Melissa A. St. Hilaire, et al. Accid Anal Prev. ;50:992-1002.
2.
Figure 2

Figure 2. Classification of response by time within study for the two different methods. From: Classifying performance impairment in response to sleep loss using pattern recognition algorithms on single session testing.

The number of test sessions classified as 1, 2 or 3 were compared between EDWS 1, the first extended duration work shift of interns on a Q3 schedule, and EDWS 6, the sixth extended duration work shift ~18 days later. Test sessions classified as 1 decreased from EDWS 1 to EDWS 6 and those classified as 2 or 3 increased across EDWS for both the kNN (lower left panel) and Naïve Bayes (upper right panel) methods as well as the classification based on PVT lapses (lower right panel). Actual classification, determined post-hoc based on relative mean slowest 10% RTs, is presented for comparison (upper left panel).

Melissa A. St. Hilaire, et al. Accid Anal Prev. ;50:992-1002.

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