Perception of simulated driving performance after sleep restriction and caffeine
Date
2007
Authors
Biggs, S.
Smith, A.
Dorrian, J.
Reid, K.
Drew, D.
van den Heuvel, C.
Baulk, S.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Journal of Psychosomatic Research, 2007; 63(6):573-577
Statement of Responsibility
Sarah N. Biggs, Andrew Smith, Jill Dorrian, Kathryn Reid, Drew Dawson, Cameron van den Heuvel and Stuart Baulk
Conference Name
Abstract
Objective As feelings of alertness are reported to be highly correlated with performance perception, the objective of this study was to determine whether caffeine, a common countermeasure to driver sleepiness, affected a sleepy driver's ability to monitor his or her simulated driving performance. Methods Twelve healthy young adults (six males, six females) participated in three counterbalanced, blinded, daytime conditions: control [9 h time in bed (TIB)], 100 mg caffeine (4 h TIB), and placebo (4 h TIB). Driving performance was measured through lane drift on a series of 30-min simulated driving sessions. Subjective sleepiness and perception of driving performance were measured at 5-min intervals during driving sessions via the Karolinska Sleepiness Scale and a corresponding perception scale. Results Sleep restriction had a significant detrimental effect on driving performance and subjective measures. Caffeine resulted in significant improvements across all measures. Subjective measures were found to be significantly correlated after sleep restriction and prior to caffeine. Correlations between actual and perceived performance were nonsignificant across all conditions. Conclusions The strong correlation between subjective measures supports the postulation that sleepiness is used as a cue for performance prediction when sleep restricted. The relationship between perceived and actual performance after fatigue countermeasures remains inconclusive. Further research, addressing limitations, is needed.
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Copyright © 2007 Elsevier Inc. All rights reserved.
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