The validity of psychomotor vigilance tasks of less than 10-minute duration |
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Authors: | Email author" target="_blank">Sylvia?LohEmail author Nicole?Lamond Jill?Dorrian Gregory?Roach Drew?Dawson |
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Institution: | 1.University of South Australia,Woodville,Australia;2.Centre for Sleep Research, 5th Floor, Basil Hetzel Institute,Queen Elizabeth Hospital,Woodville,Australia |
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Abstract: | The 10-min psychomotor vigilance task (PVT) has often been used to assess the impact of sleep loss on performance. Due to
time constraints, however, regular testing may not be practical in field studies. The aim of the present study was to examine
the suitability of tests shorter than 10 min. in duration. Changes in performance across a night of sustained wakefulness
were compared during a standard 10-min PVT, the first 5 min of the PVT, and the first 2 min of the PVT. Four performance metrics
were assessed: (1) mean reaction time (RT), (2) fastest 10% of RT, (3) lapse percentage, and (4) slowest 10% of RT. Performance
during the 10-min PVT significantly deteriorated with increasing wakefulness for all metrics. Performance during the first
5 min and the first 2 min of the PVT deteriorated in a manner similar to that observed for the whole 10-min task, with all
metrics except lapse percentage displaying significant impairment across the night. However, the shorter the task sampling
time, the less sensitive the test is to sleepiness. Nevertheless, the 5-min PVT may provide a viable alternative to the 10-min
PVT for some performance metrics. |
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