In this paper an elementary information-processing model of signal-detection behaviour is described and the result of a computer simulation of the model is reported. The results of the simulation were qualitatively more consistent with human signal-detection behaviour than the predictions from signal detectability, high threshold, and probability-matching models. Predictions were made of behaviour in experiments involving changes in signal intensity, forced-choice experiments and competing task situations. These were empirically testable and extended the range of experimental situations beyond those suggested by purely mathematical models.
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