Method Participants –In total, 26 participants (19 females and 7 males) –Mean age of 24 yrs (SD...
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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 NRMA - ACT ROAD SAFETY TRUST
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Results 30 min nap break KSS 1KSS 2 Hazard Perception driving simulation task 5 mins EEG Duration of driving Duration of driving: M = 36.1 mins (SD = 17.7; range = 15-76) No participant could have been judged to have fallen asleep by standard criteria NRMA - ACT ROAD SAFETY TRUST M = 6.65 M = 8.15 Sig increase No sig change Theta and alpha power levels
Transcript of Method Participants –In total, 26 participants (19 females and 7 males) –Mean age of 24 yrs (SD...
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
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
NRMA - ACT
ROAD SAFETY TRUST
30 min nap break
KSS 1 KSS 2
Hazard Perception driving simulation task
5 mins EEG 5 mins EEGDuration of driving
Results
30 min nap break
KSS 1 KSS 2
Hazard Perception driving simulation task
5 mins EEG 5 mins EEG
Duration of driving
•Duration of driving: M = 36.1 mins (SD = 17.7; range = 15-76)
• No participant could have been judged to have fallen asleep by standard criteria
NRMA - ACT
ROAD SAFETY TRUST
M = 6.65
M = 8.15Sig increase
No sig changeTheta and alpha power levels
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
Sleep time (% of total)SOL (SD) Duration (SD) Stage 1 Stage 2 Stage 3 Stage 4 REM8.61 (7.78) 15.09 (8.11) 24.33 67.39 6.8 1.48 -
NRMA - ACT
ROAD SAFETY TRUST
