Abstract
The computer program described in this article demonstrates the basic concepts of signal detection theory and illustrates the effect of changes in the payoff matrix on beta, a measure of response bias. Observers attempt to identify the trials on which there was a signal in a noisy visual display. They earn or lose points for correct or incorrect answers. After three sets of 100 trials, with a different payoff matrix for each set, the program provides observers with their hit rates, false alarm rates, d' scores, and beta scores for the three sets of trials, as well as the total points they have earned for the 300 trials. The program runs on MS-DOS machines and does not require a computer with graphics capabilities.
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