Abstract
When a visual display contains two targets, both of which require the same response, reaction times (RTs) are faster than when only one target appears. This effect has previously been obtained regardless of whether the redundant targets are the same or different in shape, and in at least one set of two-target experiments, the redundancy gains have been larger for different targets (Grice & Reed, 1992). Experiments with two different targets have also revealed violations of the race-model inequality, suggesting that redundant targets coactivate the response (Miller, 1982). The present paper reexamines both of these findings, because both appear to be inconsistent with the interactive race model (Mordkoff & Yantis, 1991). Experiment 1 shows that the race-model inequality is not violated when the experimental design is free of biased contingencies; Experiment 1 also provides evidence that target preferences may artifactually produce the RT advantage fordifferent- oversame-target trials. Experiment 2, however, shows that the race-model inequality is violated when the frequencies of single- and redundant-target displays are equated (without introducing any biased contingencies), implying that the interactive race model cannot account for the results of experiments involving more than one type of target. Alternative loci for coactivation are briefly discussed.
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Biederman, I., &Checkosky, S. F. (1970). Processing redundant information.Journal of Experimental Psychology,83, 486–490.
Colonius, H. (1990). Possibly dependent probability summation of reaction time.Journal of Mathematical Psychology,34, 253–275.
Diederich, A. (1992). Probability inequalities for testing separate activation models of divided attention.Perception & Psychophysics,52, 714–716.
Duncan, J. (1980). The locus of interference in the perception of simultaneous stimuli.Psychological Review,87, 272–300.
Eriksen, C. W. (1988). A source of error in attempts to distinguish coactivation from separate activation in the perception of redundant targets.Perception & Psychophysics,44, 191–193.
Fournier, L. R., &Eriksen, C. W. (1990). Coactivation in the perception of redundant targets.Journal of Experimental Psychology: Human Perception & Performance,16, 538–550.
Garner, W. R. (1962).Uncertainty and structure as psychological concepts. New York: Wiley.
Giray, M., & Ulrich, R. (1993).Motor coactivation revealed by response force in divided and focused attention. Manuscript submitted for publication.
Grice, G. R., &Canham, L. (1990). Redundancy phenomena are affected by response requirements.Perception & Psychophysics,48, 209–213.
Grice, G. R., Canham, L., &Boroughs, J. M. (1984). Combination rule for redundant information in reaction time tasks with divided attention.Perception & Psychophysics,35, 451–463.
Grice, G. R., &Reed, J. M. (1992). What makes targets redundant?Perception & Psychophysics,51, 437–442.
Kubovy, M., & Cohen, D. (1991, November).Are texture segregation by form and color independent of each other? Paper presented at the meeting of the Psychonomic Society, San Francisco, CA.
Miller, J. (1978). Multidimensional same-different judgments: Evidence against independent comparisons of dimensions.Journal of Experimental Psychology: Human Perception & Performance,4, 411–422.
Miller, J. (1982). Divided attention: Evidence for coactivation with redundant signals.Cognitive Psychology,14, 247–279.
Miller, J. (1988). Components of the location probability effect in visual search tasks.Journal of Experimental Psychology: Human Perception & Performance,14, 453–471.
Miller, J. (1991). Channel interaction and the redundant-targets effect in bimodal divided attention.Journal of Experimental Psychology: Human Perception & Performance,17, 160–169.
Miller, J., &Hardzinski, M. (1981). Case specificity of the stimulus probability effect.Memory & Cognition,9, 205–216.
Miller, J., &Lopes, A. (1988). Testing race models by estimating the smaller of two true mean or true median reaction times: An analysis of estimation bias.Perception & Psychophysics,44, 513–524.
Miller, J,, &Lopes, A. (1991). Bias produced by fast guessing in distribution-based tests of race models.Perception & Psychophysics,50, 584–590.
Miller, J., &Pachella, R. (1973). Locus of the stimulus probability effect.Journal of Experimental Psychology,101, 227–231.
Miller, J., Schäffer, R., &Hackley, S. A. (1991). Effects of preliminary information in a go versus no-go task.Acta Psychologica,76, 241–292.
Mordkoff, J. T. (1992). Testing race models of the redundant-signals effect: A warning concerning the combination-rule regression analysis.Perception & Psychophysics,52, 589–594.
Mordkoff, J. T., &Yantis, S. (1991). An interactive race model of divided attention.Journal of Experimental Psychology: Human Perception & Performance,17, 520–538.
Mordkoff, J. T., &Yantis, S. (1993). Dividing attention between color and shape: Evidence of coactivation.Perception & Psychophysics,53, 357–366.
Mullin, P. A., Egeth, H. E., &Mordkoff, J. T. (1988). Redundant-target detection and processing capacity: The problem of positional preferences.Perception & Psychophysics,43, 607–610.
Raab, D. (1962). Statistical facilitation of simple reaction time.Transactions of the New York Academy of Sciences,43, 574–590.
Reicher, G. M., Snyder, C. R. R., &Richards, J. T. (1976). Familiarity of background characters in visual scanning.Journal of Experimental Psychology: Human Perception & Performance,2, 522–530.
Schwarz, W. (1989). A new model to explain the redundant-signals effect.Perception & Psychophysics,46, 498–500.
Shaw, M. L. (1982). Attending to multiple sources of information: I. The integration of information in decision making.Cognitive Psychology,14, 353–409.
Townsend, J. T., &Nozawa, G. (1992).On the spatio-temporal properties of elementary perception: An investigation of parallel, serial, and coactive theories (Rep. No. 65) Bloomington, IN: Indiana University, Cognitive Science Program.
Ulrich, R., &Giray, M. (1986). Separate-activation models with variable base times: Testability and checking of cross-channel dependency.Perception & Psychophysics,39, 248–254.
van der Heijden, A. H. C. (1975). Some evidence for a limited capacity parallel se If-terminating process in simple visual search tasks.Acta Psychologica,39, 21–41.
van der Heuden, A. H. C., Schreuder, R., Maris, L., &Neerincx, M. (1984). Some evidence for correlated separate activation in a simple letter-detection task.Perception & Psychophysics,36, 577–585.
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This work was supported by Public Health Service Training Grant T32-MH14268 and Grant R01-MH40733 from the National Institutes of Mental Health.
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Mordkoff, J.T., Miller, J. Redundancy gains and coactivation with two different targets: The problem of target preferences and the effects of display frequency. Perception & Psychophysics 53, 527–535 (1993). https://doi.org/10.3758/BF03205201
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DOI: https://doi.org/10.3758/BF03205201