Contents: Part I: Foundations and Epistemology. E. Scheerer, Fechner's Inner Psychophysics: Its Historical Fate and Present Status. L.E. Marks, Freud and Fechner, Desire and Energy, Hermeneutics and Psychophysics. G. Mandler, Toward a Theory of Consciousness. A. Ben-Ze'ev, Cognitive Development: Two Paradigms. C. van Leeuwen, Drawing Inferences from Representation Structure: In Defense of a Formal Theory of Representations. J.T. Townsend, On the Proper Scales for Reaction Time. Part II: Experimental Themes: Perspectives and Critical Analyses. W.K. Estes, Mental Psychophysics of Categorization and Decision. S.E. Palmer, Reference Frames in the Perception of Spatial Structure. P. Petzold, Context Effects in Judgments of Attributes: An Information-Integration Approach. A. Parducci, Elaborations Upon Psychophysical Contexts for Judgment: Implications of Cognitive Models. S. Imai, Fundamentals of Cognitive Judgments of Pattern. D. Algom, Psychophysical Analysis of Pain: A Functional Perspective. H-G. Geissler, New Magical Numbers in Mental Activity: On a Taxonomic System for Critical Time Periods.