Download or read book An Experimental Study of Spatial Frequency Adaptation Effects in the Human Visual System written by William A. Clemens (CAPT, USAF.) and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of Spatial Frequency Adaptation Effects in the Human Visual System written by William A. Clemens and published by . This book was released on 1979 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents an investigation of a hypothesis, based on a receptive field model of the visual system, proposing that the receptive field organization changes in response to a change in the average luminance of the visual stimulus. Foveal measurements of sinusoidal spatial frequency contrast sensitivity over the range of 2 to 10 cycles per degree were made using a two period forced choice stimulus. Measurements were made at one luminance level while subjects adapted to a 6 cycle per degree sinusoidal grating of the same or different average luminance. The two luminance levels used were 3.50 and 35.0 ft. lamberts. Testing with adaptation at the same luminance produced a depression in the contrast sensitivity centered over the adapting spatial frequency. Adapting with a different average luminance level failed to produce a shift in this depression.
Download or read book Emergent Techniques for Assessment of Visual Performance written by National Research Council and published by National Academies Press. This book was released on 1985-01-01 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent vision research has led to the emergence of new techniques that offer exciting potential for a more complete assessment of vision in clinical, industrial, and military settings. Emergent Techniques for Assessment of Visual Performance examines four areas of vision testing that offer potential for improved assessment of visual capability including: contrast sensitivity function, dark-focus of accommodation, dynamic visual acuity and dynamic depth tracking, and ambient and focal vision. In contrast to studies of accepted practices, this report focuses on emerging techniques that could help determine whether people have the vision necessary to do their jobs. In addition to examining some of these emerging techniques, the report identifies their usefulness in predicting performance on other visual and visual-motor tasks, and makes recommendations for future research. Emergent Techniques for Assessment of Visual Performance provides summary recommendations for research that will have significant value and policy implications for the next 5 to 10 years. The content and conclusions of this report can serve as a useful resource for those responsible for screening industrial and military visual function.
Download or read book Stabilized Image Adaptation in the Human Visual System a Model for Spatial Temporal Luminance and Chromatic Effects written by Jesse D. Olson and published by . This book was released on 1994 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Properties of Spatial Frequency Mechanisms in the Human Visual System written by M. N. Williams and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fitting the Mind to the World written by Colin W. G. Clifford and published by Oxford University Press. This book was released on 2005-05-05 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book brings together a collection of studies from international researchers who demonstrate the brain's remarkable capacity to adapt its representation of the visual world in response to changes in its environment."--BOOK JACKET.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1980 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatial Vision written by Russell L. DeValois and published by Oxford University Press. This book was released on 1990-08-09 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents an integrated view of how we perceive the spatial relations in our visual world, covering anatomical, physiological, psychophysical, and perceptual aspects. The authors discuss the visual system primarily in terms of spatial frequency analysis using a linear systems approach. They review evidence supporting a local, patch-by-patch spatial frequency filtering of visual information rather than the global Fourier analysis other researchers have proposed. A separate chapter addresses the special issues surrounding color vision, and a brief, nonmathematical introduction to linear systems analysis is included for the uninitiated reader.
Download or read book Spatial Frequency Channels in the Human Visual System written by Norma Van Surdam Graham and published by . This book was released on 1970 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Limits on Spatial Visual Processing written by Matthew John McMahon and published by . This book was released on 2000 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Perception written by R. Held and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume was designed to focus on the problems of perception and originally was to have been solely edited by Professor Hans-Lukas Teuber who was a member of the editorial board which initiated production of the Handbook. Accordingly, he issued invitations to a number of researchers III perception asking them to contribute chapters written in a style described III his words: " . . . Ire hope that no author lI'ill feel COl/strained to undertake a major search of the literature: he could In'ite, instead. on an area in which he has been quite actire himse?t~ and II'here most of the issues are immediately obt"ious to him. In this Iray, the IITiting of the chapter should be cnjoyable rather than a chore . . it should result in a personal account of the state of a given area rather than in an encyclopedic treatise . . . the field deserves this sort of summary ret'iell", particularly (f it is pointed toward the future and speeds the convergence of det'elopments in sensory physiology and psychological studies of perception, " With the growing burden of national and international commitments includ ing departmental headship, Professor Teuber felt that it would be wise to share the editorial responsibilities for this volume and accordingly, asked Professors Richard Held and Herschel Leibowitz to co-edit the volume with him in the same spirit as outlined in his invitation to authors. They agreed to help in this task.
Download or read book Spatiotemporal Properties of the Visual System and the Effect of Attention written by Patricia Anne Costello and published by . This book was released on 2003 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tutorials on Motion Perception written by Alexander H. Wertheim and published by Springer. This book was released on 1982-10 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: From August 24-29, 1980 the international "Symposium on the Study of Motion Perception; Recent Developments and Applications", sponsored by NATO and organized by the editors of this book, was held in Veldhoven, the Netherlands. The meeting was attended by about eighty scholars, including psychologists, neurologists, physicists and other scientists, from fourteen different countries. During the symposium some fifty research papers were presented and a series of tutorial review papers were read and discussed. The research presentations have been published in a special issue of the international journal of psychonomics "Acta Psychologica" (Vol. 48, 1981). The present book is a compilation of the tutorial papers. The tutorials were arranged around early versions of the chapters now appearing in this book. The long discussions at the Veldhoven tutorial sessions resulted in extensive revisions of the texts prior to this publication. Unfortunately this led to a delay in publication, but we feel that this was justified by a greater depth of understanding which, in our opinion, has significantly increased the quality of the book. As they now stand, the chapters cover most of the issues relevant to the study of motion perception. Also they clearly reflect the intensive exchange of knowledge that took place during the symposium. As such we think that this book can be used both as an advanced text for students and scientists alike and as a comprehensive reference source.
Download or read book Visual Coding and Adaptability written by C. S. Harris and published by Psychology Press. This book was released on 2014-02-25 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1980. This book is the first integrated presentation of two of the most active areas in present-day visual research. Its inspiration and nucleus were provided by two Optical Society of America symposia, one on the coding of spatial information in the visual system and the other on adaptability of the visual system. Although the two topics might seem, at first sight, only distantly related, they are actually extensively intertwined in contemporary research. Some investigators focus on mechanisms of visual analysis but rely on experimental modification of perception to reveal the nature of the coding; others focus on perceptual modification but look at analytic elements for indications about what it is that gets modified. Likewise, most of the chapters in this book combine, in varying proportions, both themes. Adult human perception is the primary concern, but illuminating data from animal, infant, and neurophysiological studies are also discussed.
Download or read book Spatial Frequency Processing in the Human Visual System written by Robert L. Seyfert and published by . This book was released on 1980 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The human visual system responses to resolution targets whose small area spatial content has been altered from white to black has been investigated. Modified tri-bar targets were presented to observers on a rear projection screen at constant average luminance and varying levels of contrast. Each observer was asked to determine if he could see the target and if the target had been modified. Responses indicate that there is no difference in the visibility of targets in which small areas have been changed to white or black but whose spatial frequency content is the same."--Abstract.
Download or read book Human Visual Orientation written by Ian P. Howard and published by John Wiley & Sons. This book was released on 1982 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Visual Perception written by Vicki Bruce and published by Psychology Press. This book was released on 2014-08-27 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensively updated and expanded revision of the successful second edition continues to provide detailed coverage of the ever-growing range of research topics in vision. In Part I, the treatment of visual physiology has been extensively revised with an updated account of retinal processing, a new section explaining the principles of spatial and temporal filtering which underlie discussions in later chapters, and an up-to-date account of the primate visual pathway. Part II contains four largely new chapters which cover recent psychophysical evidence and computational model of early vision: edge detection, perceptual grouping, depth perception, and motion perception. The models discussed are extensively integrated with physiological evidence. All other chapters in Parts II, III, and IV have also been thoroughly updated.
