Part I. The Physiological Basis of Visual Perception. Light and Eyes. The Neurophysiology of the Retina. Visual Pathways in the Brain. Part II. Processing Retinal Images. Approaches to the Psychology of Visual Perception. Images, Filters and Features: The Primal Sketch. Perceptual Organisation. Perceiving Depth. The Computation of Image Motion. Object Recognition. Connectionist Models of Visual Perception. Part III. Visual Information for the Control of Action. Introduction to the Ecological Approach to Visual Perception. Visual Guidance Of Animal Locomotion. Visual Guidance of Human Action. Theories of the Control of Action. Event Perception. Perception of the Social World. Part IV. Conclusions. Contrasting Theories of Visual Perception.