Location

Rockport, Maine

Date

28-6-2005

Session

SESSION 1 - Lectures Quantification of Driver Performance

Abstract

This study aimed to evaluate the value of measuring microsleeps as anindicator of driving performance impairment in drowsy drivers with sleepdisorders. Drivers with sleep disorders such as obstructive sleep apnea/hypopenasyndrome (OSAHS) are at increased risk for driving performance errors due tomicrosleep episodes, which presage sleep onset. To meet this aim, we tested thehypothesis that OSAHS drivers show impaired control over vehicle steering, laneposition and velocity during microsleep episodes compared to when they aredriving without microsleeps on similar road segments. A microsleep is defined asa 3-14 sec episode during which 4-7 Hz (theta) activity replaces the waking 8-13Hz (alpha) background rhythm. Microsleep episodes were identified in theelectroencephalography (EEG) record by a neurologist certified by the AmericanBoard of Sleep Medicine. Twenty-four drivers with OSAHS were tested usingsimulated driving scenarios. Steering variability, lane position variability,acceleration and velocity measures were assessed in the periods during amicrosleep, immediately preceding (pre) microsleep, and immediately following(post) microsleep. In line with our introductory hypothesis, drivers with OSAHSdid show significantly greater variation in steering and lane position during themicrosleep episodes compared to the periods pre and post microsleep. The resultsindicate that identification of microsleep episodes can provide a marker fordeclining vehicle control of drivers with OSAHS.

Rights

Copyright © 2005 the author(s)

DC Citation

Proceedings of the Third International Driving Symposium on Human Factors in Driver Assessment, Training and Vehicle Design, June 27-30, 2005, Rockport, Maine. Iowa City, IA: Public Policy Center, University of Iowa, 2005: 18-24.

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Jun 28th, 12:00 AM

Variability of Driving Performance During Microsleeps

Rockport, Maine

This study aimed to evaluate the value of measuring microsleeps as anindicator of driving performance impairment in drowsy drivers with sleepdisorders. Drivers with sleep disorders such as obstructive sleep apnea/hypopenasyndrome (OSAHS) are at increased risk for driving performance errors due tomicrosleep episodes, which presage sleep onset. To meet this aim, we tested thehypothesis that OSAHS drivers show impaired control over vehicle steering, laneposition and velocity during microsleep episodes compared to when they aredriving without microsleeps on similar road segments. A microsleep is defined asa 3-14 sec episode during which 4-7 Hz (theta) activity replaces the waking 8-13Hz (alpha) background rhythm. Microsleep episodes were identified in theelectroencephalography (EEG) record by a neurologist certified by the AmericanBoard of Sleep Medicine. Twenty-four drivers with OSAHS were tested usingsimulated driving scenarios. Steering variability, lane position variability,acceleration and velocity measures were assessed in the periods during amicrosleep, immediately preceding (pre) microsleep, and immediately following(post) microsleep. In line with our introductory hypothesis, drivers with OSAHSdid show significantly greater variation in steering and lane position during themicrosleep episodes compared to the periods pre and post microsleep. The resultsindicate that identification of microsleep episodes can provide a marker fordeclining vehicle control of drivers with OSAHS.