Abstract
The results of recent studies suggest that perceptual sensitivity may decline over time in highevent-rate vigilance tasks either (1) when signals require successive, rather than simultaneous, discrimination or (2) when signals are difficult to discriminate from nonsignals. The joint effects of these two factors were examined in the present study. Two groups of subjects performed simultaneous- and successive-discrimination vigilance tasks requiring the discrimination of differences in line lengths at each of three levels of signal discriminabilitylow, moderate, and high. Both tasks lasted 30 min and had a high nonsignal-event rate. Perceptual sensitivity was assessed, using both parametric and nonparametric indices. For moderately or highly discriminable signals, sensitivity declined over time for the successive-discrimination task but not for the simultaneous-discrimination task. For low-discriminability signals, however, a sensitivity decrement was obtained for both tasks. These findings point to the role of the cumulative demand on attentional capacity in determining sensitivity decrement. The results are discussed in terms of attention allocation processes in high-event-rate vigilance tasks.
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References
Binford, J. R., &Loeb, M. (1966). Changes within and over repeated sessions in criterion and effective sensitivity in an auditory vigilance task.Journal of Experimental Psychology,72, 339–345.
Bowers, J. C. (1983).Stimulus homogeneity and the event rate function in sustained attention. Unpublished doctoral dissertation, University of Cincinnati.
Broadbent, D. E., &Gregory, M. (1963). Vigilance considered as a statistical decision.British Journal of Psychology,54, 309–323.
Buckner, D. N., &Mcgrath, J. J. (1963). A comparison of performance on single and dual sensory mode vigilance tasks. In D. N. Buckner & J J. McGrath (Eds.),Vigilance: A symposium ew York: McGraw-Hill.
Campbell, A. J. (1985). Processing strategies and letter spacing in the simultaneous- and successive-display matching tasks.Canadian Journal of Psychology,39, 162–173.
Craig, A. (1979). Nonparametric measures of sensory efficiency for sustained monitoring tasks.Human Factors,21, 69–78.
Craig, A. (1985). Signal detection theory and probability matching apply to vigilance.Proceedings of the Human Factors Society,29, 9–13.
Craig, A., Colquhoun, W. P., &Corcoran, D. W. J. (1976). Combining evidence presented simultaneously to the eye and ear: A comparison of some predictive models.Perception & Psychophysics,19, 473–484.
Davies, D. R., &Parasuraman, R. (1982).The psychology of vigilance. London: Academic Press.
Davies, D. R., Parasuraman, R., &Toh, A. (1984). Time of day, memory load, and vigilance. In A. Mitai (Ed.),Trends in ergo nomics/human factors I. Amsterdam: North-Holland.
Dember, W. N., Joshi, A., Warm, J. S., & Scerbo, M. W. (1985, November).Effects of event rate and spatial uncertainty on performance in simultaneous and successive vigilance tasks. Paper presented at the meeting of the Psychonomic Society, Boston, MA.
Dittmar, M., Warm, J. S., &Dember, W. N. (1985). Effects of knowledge of results on performance in successive and simultaneous discrimination vigilance tasks’ A signal detection analysis. In R. E. Eberts & C. G. Eberts (Eds ),Trends in ergonomics/human factors II. Amsterdam: North-Holland.
Fisk, A. D., &Schneider, W (1981). Control and automatic processing during tasks requiring sustained attention: A new approach to vigilanceHuman Factors,23, 737–750.
Jerison, H. J., &Pickett, R. M. (1964). Vigilance: The importance of the elicited observing rate.Science,143, 970–971.
Lanzetta, T. M., Warm, J. S, Dember, W. N., &Berch, D. B. (1985). Information processing load and the event rate function in sustained attention.Proceedings of the Human Factors Society,29, 1084–1085.
Loeb, M, &Binford, J. R. (1968) Vanation in performance on auditory and visual monitoring tasks as a function of signal and stimulus frequenciesPerception & Psychophysics,4, 361–366.
Nuechterlein, K., Parasuraman, R., &Jiang, Q. (1983) Visual sustained attention: Image degradation produces rapid sensitivity decre ment over timeScience,220, 327–329.
Parasuraman, R. (1976) Consistency of individual differences in human vigilance performance. An abilities classification analysis.Journal of Applied Psychology,61, 486–492.
Parasuraman, R (1979) Memory load and event rate control sensitivity decrements in sustained attentionScience,205, 924–927
Parasuraman, R (1985). Sustained attention: A multifactorial approach. In M. I. Posner & O. S. M. Marin (Eds.),Attention and performance XI, Hillsdale, NJ: Erlbaum.
Parasuraman, R. (1986). Vigilance, monitoring, and search In K. Boff, L. Kaufman, & J. Thomas (Eds.),Handbook of perception and human performance: Vol 2. Cognitive processes and performance New York: Wiley.
Parasuraman, R., &Davies, D R (1975). Response and evoked potential latencies associated with commission errors in visual monitoring.Perception & Psychophysics,17, 465–468.
Parasuraman, R., &Davies, D. R. (1977). A taxonomic analysis of vigilance performance. In R. R. Mackie (Ed.),Vigilance. Theory, operational performance, and physiological correlates New York Plenum Press.
Pollack, I., &Norman, D. A. (1964) A nonparametnc analysis of recognition experiments.Psychonomic Science,1, 125–126
Posner, M. I (1978).Chronometrie explorations of mind Hillsdale, NJ Erlbaum.
Swfts, J A (1977) Signal detection theory applied to vigilance In R R Mackie (Ed.),Vigilance Theory, operational performance, and physiological correlates New York Plenum Press
Sweis, J A (1986) Indices of discrimination or diagnostic accuracv. Their ROCs and implied modelsPsychological Bulletin,99, 100–117.
Swets, J A, &Kristofferson ,A B (1970) Attention AnnualReviw of Psychology,21, 339–366
Warm, J S., &Jerison, H J (1984). The psychophysics of vigilance In J S. Warm (Ed),Sustained attention in human performance London Wiley
Williges, R. C (1969). Withm-session criterion changes compared to an ideal observer in a visual monitoring task.Journal of Experimental Psychology,81, 61–66
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Parasuraman, R., Mouloua, M. Interaction of signal discriminability and task type in vigilance decrement. Perception & Psychophysics 41, 17–22 (1987). https://doi.org/10.3758/BF03208208
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DOI: https://doi.org/10.3758/BF03208208