Abstract
Although considerable effort has been devoted to the description of processes underlying discriminations along single dimensions, there have been few attempts to determine whether or how these elementary processes are combined when discrimination requires the consideration of more than one stimulus dimension. In the present experiment, Ss were required to indicate whether two simultaneously presented multidimensional visual stimuli were identical or different. The response measure was reaction time, and Ss had a monetary incentive to respond both quickly and accurately. It was concluded that the most appropriate model for this task is one that assumes that dimensions are compared serially, and that the order in which dimensions are compared varies from trial-to-trial. Further, when a pair differs along several dimensions, Ss do not necessarily examine every dimension before initiating the response “Different.”
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The study reported here is part of a dissertation submitted to the faculty of the Department of Psychology of the University of Michigan in partial fulfillment of the requirements for the Ph.D. degree. The research was supported by the Advanced Research Projects Agency, Department of Defense, and was monitored by the Air Force Office of Scientific Research, under Contract No. AF 49 (638)-1235 with the Human Performance Center, University of Michigan. The author held a National Science Foundation Fellowship while the research was being carried out. The generous help of J. D. Birch, P. M. Fitts, J. E. K. Smith, R. S. Tikofsky, and D. J. Weintraub is gratefully acknowledged.
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Egeth, H.E. Parallel versus serial processes in multidimensional stimulus discrimination. Perception & Psychophysics 1, 245–252 (1966). https://doi.org/10.3758/BF03207389
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DOI: https://doi.org/10.3758/BF03207389