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Related Experiment Videos

Waking effectiveness of visual alerting signals

S K Bowman1, D G Jamieson, R D Ogilvie

  • 1Hearing Health Care Research Unit, University of Western Ontario, London, Canada.

Journal of Rehabilitation Research and Development
|February 1, 1995
PubMed
Summary

Visual alarm devices for smoke detectors do not reliably wake individuals from deep sleep stages. Even intense strobes under ideal conditions failed to consistently awaken participants, questioning their safety effectiveness.

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Area of Science:

  • Sleep Science
  • Emergency Alert Systems
  • Human Factors Engineering

Background:

  • Individuals with hearing loss depend on non-acoustic alarms for emergencies.
  • Existing visual smoke detector alarms are reported to be unreliable for waking sleepers.
  • Deep sleep stages, including slow wave sleep (SWS) and rapid-eye-movement sleep (REM), present significant challenges for arousal.

Purpose of the Study:

  • To evaluate the efficacy of visual alerting devices in waking individuals from SWS and REM sleep.
  • To correlate device optical characteristics with waking performance.
  • To determine if current visual alarm technology can reliably alert sleeping individuals during a fire emergency.

Main Methods:

  • Two experiments were conducted to assess strobe light effectiveness.

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  • Various strobe intensities and placement locations were tested.
  • Subjects were exposed to strobes until awakening or for a maximum of 5 minutes under smoke-free conditions.

    • Main Results:

    • Visual alerting devices, even at high intensities, did not consistently wake subjects from deep sleep.
    • The most intense commercially available devices failed to reliably awaken participants in simulated emergency conditions.
    • Consistent arousal was not achieved despite direct light exposure over the subject's face.

    Conclusions:

    • Current visual alarm devices for smoke detectors are unreliable for waking individuals from deep sleep.
    • The effectiveness of visual alerting systems in emergency situations remains uncertain.
    • Further research is needed to develop reliable visual or tactile alarm solutions for the hearing impaired.