Ian P. Howard – författare

This book is a survey of knowledge about binocular vision, with an emphasis on its role in the perception of a three-dimensional world. The primary interest is biological vision. In each chapter, physiological, behavioral, and computational approaches are reviewed in some detail, discussed, and interrelated. The authors describe experiments required to answer specific questions and relates them to new terminologies and current theoretical schemes.

Perceiving in Depth is a sequel to Binocular Vision and Stereopsis and to Seeing in Depth, both by Ian P. Howard and Brian J. Rogers. This three-volume work is much broader in scope than previous texts and includes mechanisms of depth perception by all senses, including aural, electrosensory organs, and the somatosensory system. The work contains three extensively illustrated and referenced volumes. Volume 1 reviews sensory coding, psychophysical and analytic procedures, and basic visual mechanisms. Volume 2 reviews stereoscopic vision. Volume 3 reviews all mechanisms of depth perception other than stereoscopic vision. Together, these three volumes provide the most detailed review of all aspects of perceiving the three-dimensional world.Volume 1 contains a historical background and address basic coding process, an account of basic psychophysical procedures and principles of sensory coding, and an account of basic mechanisms underlying visual depth perception. It starts with a review of the history of investigations of visual depth perception from the ancient Greeks to the early 20th century. Depth-detection mechanisms in senses other than vision were not investigated before the 19th century. Special attention is devoted to the discovery of the principles of perspective in 15th century Florence, and the discovery of the principles of stereoscopic vision. The chapter ends with a review of early visual display systems, such as panoramas and peepshows, and the discovery and development of stereoscopes and stereophotography. One chapter reviews the psychophysical and analytic procedures used in behavioral investigations of depth perception. Another chapter deals with the broad topic of sensory coding, including the geometry of visual space, mechanisms of attention, and experience-dependent plasticity of visual functions. A review of the structure and physiology of the primate visual system proceeds from the eye through the LGN to the visual cortex and higher visual centers. This is followed by a review of the early evolution of visual systems and of the development of the mammalian visual system in the embryo and post-natal period, with an emphasis on mechanisms of neural plasticity. The development of perceptual functions, especially depth perception, in human infants is then reviewed. These chapters provide a foundation for a review of the effects of early visual deprivation during the critical period of neural plasticity on the development of the various types of amblyopia and of defects in visual depth perception. Various forms of deprivation are discussed, including dark rearing, binocular and monocular enucleation, strabismus, and eyelid suturing. Volume 1 ends with reviews of the accommodation mechanism of the human eye and vergence eye movements.

Perceiving in Depth is a sequel to Binocular Vision and Stereopsis and to Seeing in Depth, both by Ian P. Howard and Brian J. Rogers. This three-volume work is much broader in scope than previous texts and includes mechanisms of depth perception by all senses, including aural, electrosensory organs, and the somatosensory system. The work contains three extensively illustrated and referenced volumes. Volume 1 reviews sensory coding, psychophysical and analytic procedures, and basic visual mechanisms. Volume 2 reviews stereoscopic vision. Volume 3 reviews all mechanisms of depth perception other than stereoscopic vision. Together, these three volumes provide the most detailed review of all aspects of perceiving the three-dimensional world.Volume 3 addresses all depth-perception mechanisms other than stereopsis. The chapter starts with reviews of monocular cues to depth. These cues include accommodation, vergence eye movements, perspective, interposition, shading, and motion parallax. A perceptual constancy is the ability to judge a feature of a stimulus as constant in spite of variations in the retinal image. Constancies in depth perception, such as the ability to perceive the sizes, and 3-D shapes of objects as they move or rotate are reviewed. The ways in which different depth cues interact are discussed. They can complement each other, compete, or interact so as to increase the range of depth perception. The next chapter reviews sources of information, such as changing disparity, image looming, and vergence eye movements, used in the perception of objects moving in depth. Various pathologies of depth perception, including visual neglect, stereoanomalies, and albanism are reviewed. Visual depth-perception mechanisms through the animal kingdom are reviewed, starting with insects and progressing though crustaceans, fish, amphibians, retiles, birds, and mammals. Most animals respond to image looming, and many use perspective and motion parallax to detect depth. Stereoscopic vision based on binocular disparity has evolved in some insects, frogs, and mammals. The chapter includes a discussion of the way in which stereoscopic vision may have evolved. The next chapter describes how visual depth perception is used to guide reaching movements of the hand, avoiding obstacles, and walking to a distant object. The next three chapters review non-visual mechanisms of depth perception. Auditory mechanisms include auditory localization, echolocation in bats and marine mammals, and the lateral-line system of fish. Some fish emit electric discharges and then use electric sense organs to detect distortions of the electric field produced by nearby objects. Some beetles and snakes use heat-sensitive sense organs to detect sources of heat. The volume ends with a discussion of mechanisms used by animals to navigate to a distant site. Ants find their way back to the nest by using landmarks and by integrating their walking movements. Several animals navigate by the stars or by polarized sunlight. It seems to be established that animals in several phyla navigate by detecting the Earth's magnetic field.

This book is a comprehensive survey of binocular vision, with an emphasis on its role in the perception of a three-dimensional world. The central theme is biological vision; machine vision and computational models are discussed where they contribute to an understanding of living systems. Clinical research is reviewed where it offers insight into normal functioning. Key terms are in the text and printed in bold type and cross-referenced in the subject index, which serves as a glossary.