Experimental Psychology Laboratory, University of Sussex.
SIGNAL PROBABILITY AND VIGILANCE: A REAPPRAISAL OF THE ‘SIGNAL-RATE’ EFFECT
Article first published online: 13 APR 2011
1969 The British Psychological Society
British Journal of Psychology
Volume 60, Issue 2, pages 169–178, May 1969
How to Cite
BADDELEY, A. D. and COLQUHOUN, W. P. (1969), SIGNAL PROBABILITY AND VIGILANCE: A REAPPRAISAL OF THE ‘SIGNAL-RATE’ EFFECT. British Journal of Psychology, 60: 169–178. doi: 10.1111/j.2044-8295.1969.tb01189.x
- Issue published online: 13 APR 2011
- Article first published online: 13 APR 2011
- Manuscript received 22 July 1968; revised manuscript received 30 October 1968
- Cited By
Performance on a 40 min. visual task was studied as a function of signal probability. A separate group was tested at each of five levels of signal probability (0·02, 0·06, 0·18, 0·24 and 0·36). Percent detections increased with signal probability. This increase was accompanied by a rise in the false report rate, and analysis in terms of signal detection theory suggested that signal probability affects the subject's criterion (β) rather than his ability to discriminate (d′).