Contents: Preface. H-G. Geissler, Guest Editorial. Part I: Theories of Psychophysical Judgment.R.D. Luce, Guest Editorial. E.N. Dzhafarov, Perceptual Separability of Stimulus Dimensions: A Fechnerian Analysis. C.A. Izmailov, E.N. Sokolov, Subjective and Objective Scaling of Large Color Differences. P. Petzold, G. Haubensak, Short-Term and Long-Term Frames of Reference in Category Judgments: A Multiple-Standards Model. V. Sarris, Frame of Reference Models in Psychophysics: A Perceptual-Cognitive Approach. J.T. Townsend, J. Spencer-Smith, Two Kinds of Global Perceptual Separability and Curvature. Part II: Timing and Dynamics of Human Performance.H. Colonius, Guest Editorial. G. Aschersleben, J. Gehrke, W. Prinz, A Psychophysical Approach to Action Timing. M.A. Elliott, H.J. Muller, Synchronization and Stimulus Timing: Implications for Temporal Models of Visual Information Processing. H-G. Geissler, Functional Architectures in Structural Recognition and the Role of "Seeming Redundancy." T. Lachmann, C. van Leeuwen, Memory-Guided Inference in Same-Different Comparison Tasks. H.J. Muller, J. Krummenacher, D. Heller, Dimension-Based Visual Attention and Visual Object Segmentation. O. Neumann, M. Niepel, Timing of "Perception" and Perception of "Time." D. Vorberg, U. Mattler, A. Heinecke, T. Schmidt, J. Schwarzbach, Invariant Time Course of Priming With and Without Awareness. D.G. Watson, G.W. Humphreys, C.N.L. Olivers, Visual Marking: Using Time as Well as Space in Visual Selection. Part III: Psychophysics of Memory.N. Cowan, Guest Editorial. J. Bredenkamp, Cavanagh's Hypotheses Within the Context of Other Invariance Hypotheses: Theory and Data. C. Kaernbach, Auditory Sensory Memory and Short-Term Memory. U. Lass, G. Luer, D. Becker, Y. Fang, G. Chen, Encoding and Retrieval Components Affecting Memory Span: Articulation Rate, Memory Search, and Trace Redintegration. U. Roeber, C. Kaernbach, Memory Scanning Beyond the Limit--If There Is One. E. Schroger, M. Tervaniemi, M. Huotilainen, Bottom-Up and Top-Down Flows of Information Within Auditory Memory: Electrophysiological Evidence. Part IV: Neural and Representational Models.A. Aertsen, Guest Editorial. S. Grossberg, The Complementary Brain: From Brain Dynamics to Conscious Experiences. R. Kompass, Universal Temporal Structures in Human Information Processing: A Neural Principle and Psychophysical Evidence. E. Leeuwenberg, Structural Information Theory and Visual Form.