The following are the proceedings of the Third International Workshop on Perception held in Pavia, Italy, on September 27-30, 1993, under the auspices of four institutions: the Group of Cybernetic and Biophysics (GNCB)s of the National Research Council (CNR), the Italian Association for Artificial Intelligence (AI * IA), the Italian Association of Psychology (AlP), and the Italian Chapter of the International Association for Pattern Recognition (IAPR). The theme of this third workshop was: "Human and Machine Vision: Analogies and Divergencies." A wide spectrum of topics was covered, ranging from neurophysiology, to computer architecture, to psychology, to image understanding, etc. For this reason the structure of this workshop was quite different from those of the first two held in Parma (1991), and Trieste (1992). This time the workshop was composed of just eight modules, each one consisting of two invited lectures (dealing with vision in nature and machines, respectively) and a common panel discussion (including the two lecturers and three invited panellists).

The Phylogenetic Evolution of the Visual System.- A Control View to Vision Architectures.- Panel Summary - One Model for Vision Systems?.- Structure and Function in the Retina.- On-Chip Vision.- Panel Summary - Foveation, Log-Polar Mapping and Multiscale Approaches to Early Vision.- Neurophysiology of the Striate Cortex.- Visual Form Representation.- Panel Summary - Looking for Visual Primitives.- The Oculomotor System.- Active Vision.- Panel Summary - Allocation of Attention in Vision.- New Wine in Old Barrels: Knowing How to Move Tells Us How to Perceive Movement.- Motion Analysis.- Panel Summary - Dynamic Perception of the Environment.- Visual Cognition and Cognitive Modeling.- Models and Descriptions in Machine Vision.- Panel Summary - Icons and Words: Metaphors and Symbolisms.- Visual Thinking: Stability and Self-Organisation.- Spatial Reasoning as a Tool for Scene Generation and Recognition.- Panel Summary - Image Interpretation and Ambiguities.- From Imagery to Imagination.- Neural Networks, Fuzziness and Image Processing.- Panel Summary - Perceptual Learning and Discovering.- Evening Presentation - The State of the Art in Virtual Reality.