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Vigilance pp 645-663 | Cite as

The Effects of Raised Signal and Noise Amplitude During the Course of Vigilance Tasks

  • D. W. J. Corcoran
  • J. Mullin
  • Mary Teresa Rainey
  • Gordon Frith
Part of the NATO Conference Series book series (NATOCS, volume 3)

Abstract

Using the auditory vigilance task developed by Wilkinson, Edwards, and Haines (1966) in which tones of a short rather than a long duration are defined as signals, the amplitude at which both signals and non-signals were relayed to subjects was varied between four groups. In the 70 dB and 90 dB groups, the sound pressure level at the ear was 70 dB and 90 dB, respectively, for the duration of the task. For the 70/90 dB and 90/70 dB groups, the amplitude of the input was changed to the higher and lower levels, respectively, halfway through the task. All tests were conducted between 0800 and 0900 hours.

Although the changed amplitude did not affect the physical S/N ratio, changes in detections, false alarms, d’, and β resulted. Of particular interest were the findings (1) that increased amplitude increased d’ and reduced β, (2) that decrement resulted from both d’ and β changes, and (3) that whereas all other groups showed a significant decrement, the 70/90 dB group showed a “vigilance increment” over time.

Keywords

False Alarm False Alarm Rate Ambient Noise Visual Search Task Noise Amplitude 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • D. W. J. Corcoran
    • 1
  • J. Mullin
    • 1
  • Mary Teresa Rainey
    • 1
  • Gordon Frith
    • 1
  1. 1.Department of PsychologyUniversity of GlasgowGlasgowScotland

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