Abstract
Signal Detectability Theory (SDT) was applied to the discrimination of the source (magazine) of two-word and four-word samples of English text. Operating characteristics obtained from ratings of individual four-word samples were well fit by an SDT theoretical curve, but two-word data were poorly fitted. Indices of signal detectability derived from rating responses, two alternative forced choice responses, and four alternative forced choice responses were found to be equivalent, thus supporting a key implication of SDT.
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1. This research was supported by the National Science Foundation Grant GB-3081. Thanks are due to Drs. Kenneth B. Little and Donald Stilson for valuable suggestions and to Terry C. Weyl for assistance in data analysis.
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Ulehla, Z.J., Canges, L. & Wackwitz, F. Signal detectability theory applied to conceptual discrimination. Psychon Sci 8, 221–222 (1967). https://doi.org/10.3758/BF03331631
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DOI: https://doi.org/10.3758/BF03331631