Many vigilance tasks require discrimination of infrequent signal events from frequent nonsignals. During performance on these tasks signal detections often decline. But this does not generally signify a loss of vigilance, if one can rely on signal detection analyses showing that signal discriminability remains constant during a vigil and hence that neither attention nor signal processing has waned. This paper confirms that signal detection theory does provide a good fit to vigilance data and that the analyses can therefore be relied on. The paper also shows that probability matching (of signal reports to signal occurrence) occurs. In the main it is the adjustment of report rate toward matching by an alert observer, in control of his or her performance, that produces the vigilance decrement in detections.
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References
1.
Baker, C. H. (1963). Further toward a theory of vigilance. In D. N. Buckner and J. J. McGrath (Eds.), Vigilance: A symposium (pp. 137–154). New York: McGraw-Hill.
2.
Binford, J. R., and Loeb, M. (1966). Changes within and over repeated sessions in criterion and effective sensitivity in an auditory vigilance task. Journal of Experimental Psychology, 72, 329–345.
3.
Broadbent, D. E. (1971). Decision and stress. London: Academic Press.
4.
Colquhoun, W. P., and Baddeley, A. D. (1967). Influence of signal probability during pre-training on vigilance decrement. Journal of Experimental Psychology, 73, 153–155.
5.
Craig, A. (1977). Broadbent and Gregory revisited: Vigilance and statistical decision. Human Factors, 19, 25–36.
6.
Craig, A. (1978). Is the vigilance decrement simply a response adjustment toward probability matching?Human Factors, 20, 441–446.
7.
Craig, A. (1979). Vigilance for two kinds of signal with unequal probabilities of occurrence. Human Factors, 21, 647–653.
8.
Craig, A. (1980). Effect of prior knowledge of signal probabilities on vigilance performance at a two-signal task. Human Factors, 22, 361–371.
9.
Craig, A. (1981). Monitoring for one kind of signal in the presence of another: The effects of signal mix on detectability. Human Factors, 23, 191–197.
10.
Craig, A. (1983). Vigilance and inspection. Studia Psychologica, 25, 259–270.
11.
Craig, A., and Colquhoun, W. P. (1977). Vigilance effects in complex inspection. In R. R. Mackie (Ed.), Vigilance: Theory, operational performance, and physiological correlates (pp. 239–262). New York: Plenum.
12.
Davies, D. R., and Parasuraman, R. (1982). The psychology of vigilance. London: Academic Press.
13.
Fisher, R. A. (1970). Statistical methods for research workers (14th ed.). Edinburgh: Oliver and Boyd.
14.
Fisk, A. D., and Schneider, W. (1981). Control and automatic processing during tasks requiring sustained vigilance. Human Factors, 23, 737–750.
15.
Green, D. M., and Luce, R. D. (1973). Speed-accuracy trade-off in auditory detection. In S. Kornblum (Ed.), Attention and performance IV (pp. 547–569). New York: Academic Press.
16.
Grey, D. R., and Morgan, B. J. T. (1972). Some aspects of ROC curve-fitting: Normal and logistic models. Journal of Mathematical Psychology, 9, 128–139.
17.
Jerison, H. J., Pickett, R. M., and Stenson, H. H. (1965). The elicited observing rate and decision processes in vigilance. Human Factors, 7, 107–128.
18.
Leary, J. (1983). Adaptation of decision criteria in vigilance tasks. Unpublished doctoral dissertation, University of Adelaide, Adelaide, Australia.
19.
Loeb, M. (1978). On the analysis and interpretation of vigilance: Some remarks on two recent articles by Craig. Human Factors, 20, 447–451.
20.
Long, G. M., and Waag, W.L. (1981). Limitations on the practical applicability of d' and β measures. Human Factors, 23, 285–290.
21.
Luce, R. D., and Green, D. M. (1974). Detection, discrimination and recognition. In E. C. Carterette and M. P. Friedman (Eds.), Handbook of perception, vol. II (pp. 299–342). New York: Academic Press.
22.
Nuechterlein, K. H., Parasuraman, R., and Jiang, Q. (1983). Visual sustained attention: Image degradation produces rapid sensitivity decrement over time. Science, 220, 327–329.
23.
Parasuraman, R. (1979). Memory load and event rate control sensitivity decrements in sustained attention. Science, 205, 924–927.
24.
Swets, J. A., and Pickett, R. M. (1982). Evaluation of diagnostic systems: Methods from signal detection theory. New York: Academic Press.
25.
Taylor, M. M. (1967). Detectability theory and the interpretation of vigilance data. In A. F. Sanders (Ed.), Attention and performance I (pp. 390–399). Amsterdam: Elsevier Science Publishers.
26.
Thorndike, E.L. (1926). Educational psychology, vol. III. Mental work and fatigue, and individual differences and their causes. New York: Teachers College, Columbia University.
27.
Vickers, D. (1979). Decision processes in visual perception. London: Academic Press.
28.
Vickers, D., and Leary, J. N. (1983). Criterion control in signal detection. Human Factors, 25, 283–296.
29.
Vickers, D., Leary, J., and Barnes, P. (1977). Adaptation to decreasing signal probability. In R. R. Mackie (Ed.), Vigilance: Theory, operational performance and physiological correlates (pp. 679–703). New York: Plenum.
30.
Williams, P. S. (1986). Processing demands, training, and the vigilance decrement. Human Factors, 28, 567–569.
31.
Williges, R. C. (1976). The vigilance increment: An ideal observer hypothesis. In T. B. Sheridan and G. Johannsen (Eds.), Monitoring behavior and supervisory control (pp. 181–190). New York: Plenum.
