Abstract
In recent years, interest in the psychology of perception in study of the influence of nonsensory factors on man's sensory perceptual ability has been growing. Nevertheless, no study has yet raised the question of whether it is perceptual processes or the process of rendering a judgment about what has been perceived that determines the subject's responses. Contemporary psychophysics has developed an apparatus for evaluating separately the respective contributions made by the decision-making process and the sensory process proper in the overall result in an experiment. The psychophysical theory of signal detection (TSD) confirmed the notion that the influence of nonsensory factors on the outcome of an experiment extended only to the decision-making process, and was manifested in a shift in the signal value of the criterion (Green & Swets, 1966). It was experimentally confirmed that a subject's choice of judgment is actually determined by nonsensory factors (Swets et al., 1961), including feedback, for exam...
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