Vigilance performance under conditions of redundant and nonredundant signal presentation

Abstract

Brief interruptions in a sound, a light, or both the sound and light, were monitored by 41 Ss over a 3-hour period. A dual response apparatus allowed the Ss to report the light signals, the sound signals, or both. The detection rate was found to be significantly better for the redundant signals than for either alone. While the detectability of each component of the redundant signal was comparable to its corresponding single mode, a systematic deviation in the bimodal curve—from predicted to observed—was noted. It was concluded that the weaker component of a redundant signal contributes significantly to the overall detectability, and the use of dual channel displays in applied vigilance situations is justified. (PsycInfo Database Record (c) 2025 APA, all rights reserved)