Abstract
At a previous meeting, the applicability of a statistical-decision model to a sentence identification task was described. The observer's task is to decide if a message belongs to a primary or secondary subset of messages. If primary, he is to decide which alternative primary message was presented. The observers generated ROC curves consistent with the model. A fortunate by product of the model is that in addition to describing performance by a criterion-free measure, it also is possible to specify, quantitatively, the criterion adopted by the observer for the task. The criterial index yields a value on a linear scale that ranges from −0.50 (extreme strict criterion) to +0.50 (extreme lax criterion). The theoretical distributions of the index for various values of d′ and empirical data from hearing-impaired persons will be presented.
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