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Method

Method. Participants In total, 26 participants (19 females and 7 males) Mean age of 24 yrs ( SD = 2.46; range = 20-28) Materials Karolinska sleepiness scale (KSS), 9-point Likert scale Physiological sleepiness via EEG Driving task: spectral analysis of O1-A2

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Method

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  1. Method • Participants • In total, 26 participants (19 females and 7 males) • Mean age of 24 yrs (SD = 2.46; range = 20-28) • Materials • Karolinska sleepiness scale (KSS), 9-point Likert scale • Physiological sleepiness via EEG • Driving task: spectral analysis of O1-A2 • Nap break: C3-A2 scored for SOL and sleep staging • Driving stimulus: Hazard Perception task • Hazard perception is the driving skill to anticipate that a traffic situation may result in a crash or a near miss • Importantly it is the only driving skill that has a consistent relationship with actual on-road crashes (i.e., criterion validity) NRMA - ACT ROAD SAFETY TRUST

  2. Method (2) • Procedure • On testing days participants woke at 05:00 • No caffeine or alcohol until completion of testing • Instructed to “Stop when you think you would be too sleepy to drive safely on the road” • Design • Experimental design: participants randomly assigned to the morning (09:00) or afternoon (14:00) start time Duration of driving NRMA - ACT ROAD SAFETY TRUST KSS 2 KSS 1 30 min nap break Hazard Perception driving simulation task 5 mins EEG 5 mins EEG

  3. Results M = 8.15 Sig increase M = 6.65 Duration of driving NRMA - ACT ROAD SAFETY TRUST No sig change Theta and alpha power levels KSS 2 KSS 1 30 min nap break • Duration of driving: M = 36.1 mins (SD = 17.7; range = 15-76) • No participant could have been judged to have fallen asleepby standard criteria Hazard Perception driving simulation task 5 mins EEG 5 mins EEG

  4. Results (2) • Subjective sleepiness (KSS) detected an increase in sleepiness levels • Physiological sleepiness (EEG) levels did not change over the duration of drive • No circadian effects evident in any data source • Large variability of driving durations Thirty minute nap break data (n = 23) Note. SOL = sleep onset latency (min); REM = Rapid Eye Movement NRMA - ACT ROAD SAFETY TRUST

  5. Comments or Questions? christopher.watling@qut.edu.au NRMA - ACT ROAD SAFETY TRUST

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