Abstract
The two-alternative temporal forced choice (2ATFC) experiment is used to measure the relative detectabilities of a frequency change, an amplitude increase, or both together. Subjects’ performance is best when both (redundant) cues are available. This improvement is fit better by a decision threshold model than by an information integration model. Since decision processes that can lead to the decision threshold prediction in (2ATFC) experiments are not obvious, an information processing model which does is proposed. The model makes additional predictions which fit the results of an experiment which sometimes deletes information from the first or the second observation interval. The model is not consistent with the signal detection theory interpretation of the 2ATFC experiment, and these results call into question that interpretation. It is concluded that pitch and loudness are perceptually independent for the 2ATFC experiment.
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Zakorski, M. A. Some necessary conditions for the spatial representations of stimulus similarity. Mathematical Psychology Meeting. University of Michigan—Ann Arbor, 1969.
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This research was supported in part by National Science Foundation Grant NSF GB 5270 to Dr. H. Lindman and by Public Health Service Grant MH-16817 to Dr. F. Restle while the author was a mathematical psychology training fellow under the supervision ofg Dr. Restle. The instrumentation was carried out in consultation with Dr. D Robinson. The preparation of the manuscript was supported in part by National Research Council of Canada Grant A9804 to the author.
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Zagorski, M. Perceptual independence of pitch and loudness in a signal detection experiment: A processing model for 2ATFC (21FC) experiments. Perception & Psychophysics 17, 525–531 (1975). https://doi.org/10.3758/BF03203963
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DOI: https://doi.org/10.3758/BF03203963