Contents: G.E. Hinton, J.A. Anderson, Introduction to the Updated Edition. D.E. Rumelhart, D.A. Norman, Introduction. J.A. Anderson, G.E. Hinton, Models of Information Processing in the Brain. J.A. Feldman, A Connectionist Model of Visual Memory. D. Willshaw, Holography, Associative Memory, and Inductive Generalization. T. Kohonen, E. Oja, P. Lehtio, Storage and Processing of Information in Distributed Associative Memory Systems. S.E. Fahlman, Representing Implicit Knowledge. G.E. Hinton, Implementing Semantic Networks in Parallel Hardware. T.J. Sejnowski, Skeleton Filters in the Brain. J.A. Anderson, M.C. Mozer, Categorization and Selective Neurons. S. Geman, Notes on a Self-Organizing Machine. R. Ratcliff, Parallel-Processing Mechanisms and Processing of Organized Information in Human Memory.