Helton, D., Shaw, T., Warm, J.S., Matthews, G., & Hancock, P.A. (2008). Effects of warned and unwarned demand transitions on vigilance performance and stress. Anxiety, Stress, and Coping, 21(2), 173-184.
The present study was designed to explore the effects of warned and unwarned demand transitions in vigilance on performance and self-reported stress.