Abstract
Summary Although the Theory of Signal Detectability (TSD) was originally developed as a psychophysical model of sensory perception, experimenters have recently begun to apply the theory to an increasingly wide range of psychological phenomena. As a result of this increased scope of application, several methodological questions have arisen. In particular, it is argued here that the application of TSD to social perceptual problems will be facilitated by an examination of the methodological and procedural considerations associated with the ecological-functional approach to perception as developed by Brunswik and Gibson. These three theories—TSD, Brunswik's “probabilistic functionalism,” and Gibson's “functionalism”—are reviewed here, and some implications for the application of TSD to social perceptual research are examined.
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