Multidimensional scaling (MDS) techniques provide a promising measurement strategy for characterizing individual differences in cognitive processing, which many clinical theories associate with the development, maintenance, and treatment of psychopathology. The authors describe the use of deterministic and probabilistic MDS techniques for investigating numerous aspects of perceptual organization, such as dimensional attention, perceptual correlation, within-attribute organization, and perceptual variability. Additionally, they discuss how formal quantitative models can be used, in conjunction with MDS-derived representations of individual differences in perceptual organization, to test theories about the role of cognitive processing in clinically relevant phenomena. They include applied examples from their work in the areas of eating disorders and sexual coercion.Cognitive theorists implicate individual differences in social information processing, particularly construal processes, in the development, maintenance, and treatment of various forms of psychopathology (Beck, 1976;Ellis, 1994;Kelly, 1955;McFall, 1982). Clinical scientists have had difficulty finding valid methods to assess social information-processing constructs, however. One promising solution draws on the theoretical and measurement models of cognitive science (McFall, Treat, & Viken, 1997. The purpose of this article is to illustrate the potential of this solution by focusing on the use of a specific method, multidimensional scaling (MDS), for investigating individual differences in perceptual organization, that is, the way in which persons organize and represent incoming stimulus information.We first examine the conceptual strengths and methodological weaknesses of cognitive theory in clinical psychology. Next, we describe deterministic and probabilistic MDS models, which offer promise in overcoming some of these methodological limitations, and discuss their application to investigations of individual differences in perceptual organization. Finally, we describe the use of MDS to test hypotheses about the influence of perceptual organization on the operation of other cognitive processes. For illustrative purposes, we refer to two ongoing lines of research. The first is our investigation of individual differences in women's perceptions of information about other women's body size and affect and the links between these perceptions and eating disorders (Viken, Treat, Nosofsky, McFall, & Palmeri, in press). The second is our evaluation of individual differences in men's perceptions of women and the links between these perceptions and men's sexually coercive behavior (Treat, McFall, Viken, & Kruschke, 2001).
Clinical-Cognitive Theory: An ExemplarGeorge A. Kelly's personal construct theory (1955) is a promising exemplar of a cognitive theory in clinical psychology. Of course, it is only one of many possible exemplars we might choose or cite. Beck's (1976) theory, for example, has had a greater influence on cognitive-behavioral therapists, and treatments...