A model for the perception of some Morse Code-like signals is developed, tested, and generalized. In the development certain formal relations among the signals provide the bases for hypotheses concerning the relative confusability of signal pairs. The measure of confusability used in testing the hypotheses is the percentage of “same” responses to each pair in a Same-Different judgment task. The judgment data give very strong support to the hypotheses of the model. Multidimensional analyses of the data matrix reveal three prominent dimensions which are interpreted as Temporal Length, Sound-to-Silence Ratio, and Dash First—Dot First. Finally, a generalization of the model is described.
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