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Spatial Frequency Processing In The Human Visual System
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Book Synopsis Spatial Frequency Processing in the Human Visual System by : Robert L. Seyfert
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.
Book Synopsis Representations of Spatial Frequency, Depth, and Higher-level Image Content in Human Visual Cortex by : Daniel E. Berman
Download or read book Representations of Spatial Frequency, Depth, and Higher-level Image Content in Human Visual Cortex written by Daniel E. Berman and published by . This book was released on 2018 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The human visual system has been studied in great detail for millennia, but there are substantial, unanswered questions regarding the underlying characteristics of such an important sensory system. Many of these unanswered questions involve the neural correlates in which low-level features are processed in higher-level visual areas. Here, we use functional magnetic resonance imaging (fMRI) to address some of these questions concerning depth and spatial frequency perception in order to elucidate upon such fundamental aspects of visual processing and the mechanisms in which we are able to perceive the world around us. In Chapter 2, we examine the neural correlates of scene content with regards to the spatial frequency contained in these scenes. It has been long debated whether low or high spatial frequencies are what primarily represent the content of a scene and how different scene selective areas such as parahippocampal place area (PPA), retrospenial cortex (RSC) and occipital place area (OPA) process this component of the image we are viewing. Both low and high spatial frequencies contribute to scene representations, but what we find using both univariate and multivariate pattern analysis (MVPA) is that scene content is primarily represented throughout the majority of visual cortex via high spatial frequency information. Interestingly, we find that the posterior portion of PPA may have a unique role in processing low-level features like spatial frequency. Next, we address depth perception, another element of our visual system that is not fully understood. In Chapter 3 we examine whether category-selective areas such as scene-selective areas PPA, RSC and OPA, object-selective area lateral occipital cortex (LOC), face-selective areas fusiform face area (FFA) and occipital face area (OFA), and motion area (MT), are sensitive to a stimulus’ position-in-depth. We find that the scene areas prefer stimuli both behind and in front of fixation, while areas MT and LOC prefer front stimuli. Finally, in Chapter 4 we will examine whether depth representations are organized in a topographical (or “map-like”) manner. Much like classic retinotopic maps defined throughout visual cortex that are based on polar angle and eccentricity measurements utilizing 2-dimensional stimuli, we also find “depthotopic” maps using analogous methodology and analyses, known as phase-encoding mapping, The main modification is that our stimulus periodically cycles through different positions in depth instead of the x and y coordinates of visual field. These experiments provide us with a greater understanding of the neural correlates in which spatial frequency and depth are processed in high-level areas of human visual cortex.
Book Synopsis Emergent Techniques for Assessment of Visual Performance by : National Research Council
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.
Book Synopsis Some Properties of Spatial Frequency Mechanisms?in the Human Visual System by : M. N. Williams
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:
Book Synopsis Higher-Order Processing in the Visual System by : Gregory R. Bock
Download or read book Higher-Order Processing in the Visual System written by Gregory R. Bock and published by John Wiley & Sons. This book was released on 2008-04-30 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foremost neurophysiologists and psychophysicists provide pertinent information on the nature of representation at the earliest stages as this will constrain the disposition of all subsequent processing. This processing is discussed in several different types of visual perception.
Book Synopsis Spatial Vision by : Russell L. DeValois
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.
Book Synopsis Spatial Vision in Humans and Robots by : Laurence Harris
Download or read book Spatial Vision in Humans and Robots written by Laurence Harris and published by Cambridge University Press. This book was released on 1993 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: A book of great interest both to biological researchers and also to designers of robots and computer vision systems.
Book Synopsis Applications of Parallel Processing in Vision by : J.R. Brannan
Download or read book Applications of Parallel Processing in Vision written by J.R. Brannan and published by Elsevier. This book was released on 1992-01-23 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considerable evidence exists that visual sensory information is analyzed simultaneously along two or more independent pathways. In the past two decades, researchers have extensively used the concept of parallel visual channels as a framework to direct their explorations of human vision. More recently, basic and clinical scientists have found such a dichotomy applicable to the way we organize our knowledge of visual development, higher order perception, and visual disorders, to name just a few. This volume attempts to provide a forum for gathering these different perspectives.
Book Synopsis Seeing Spatial Form by : Michael Jenkin
Download or read book Seeing Spatial Form written by Michael Jenkin and published by OUP USA. This book was released on 2006 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROM contains ... "color imagery and video clips associated with various chapters and the York Vision Conference itself."--Page v.
Book Synopsis Spatial Frequency Channels in the Human Visual System by : Norma Van Surdam Graham
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:
Book Synopsis The Visual Neurosciences by : John Simon Werner
Download or read book The Visual Neurosciences written by John Simon Werner and published by MIT Press. This book was released on 2004 with total page 975 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential reference book for visual science.
Book Synopsis Spatial Vision by : Russell L. De Valois
Download or read book Spatial Vision written by Russell L. De Valois and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed to present neuroscientists, cognitive psychologists and ophthalmologists with an integrated view of how humans perceive the spatial relations in their visual world, this study covers anatomical, physiological, psychological and perceptual aspects.
Book Synopsis A Study of the Spatial Frequency Analyzing Characteristics of the Human Visual System by : Jean Adelaide Tkach
Download or read book A Study of the Spatial Frequency Analyzing Characteristics of the Human Visual System written by Jean Adelaide Tkach and published by . This book was released on 1985 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Oxford Handbook of Eye Movements by : Simon Liversedge
Download or read book The Oxford Handbook of Eye Movements written by Simon Liversedge and published by OUP Oxford. This book was released on 2011-08-18 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past few years, there has been an explosion of eye movement research in cognitive science and neuroscience. This has been due to the availability of 'off the shelf' eye trackers, along with software to allow the easy acquisition and analysis of eye movement data. Accompanying this has been a realisation that eye movement data can be informative about many different aspects of perceptual and cognitive processing. Eye movements have been used to examine the visual and cognitive processes underpinning a much broader range of human activities, including, language production, dialogue, human computer interaction, driving behaviour, sporting performance, and emotional states. Finally, in the past thirty years, there have been real advances in our understanding of the neural processes that underpin eye movement behaviour. The Oxford Handbook of Eye Movements provides the first comprehensive review of the entire field of eye movement research. In over fifty chapters, it reviews the developments that have so far taken place, the areas actively being researched, and looks at how the field is likely to devlop in the coming years. The first section considers historical and background material, before moving onto section 2 on the neural basis of eye movements. The third and fourth sections looks at visual cognition and eye movements and eye movement pathology and development. The final sections consider eye movements and reading and language processing and eye movements. Bringing together cutting edge research from and international team of leading psychologists, neuroscientists, and vision researchers, this book is the definitive reference work in this field.
Book Synopsis The Cognitive Neurosciences by : Michael S. Gazzaniga
Download or read book The Cognitive Neurosciences written by Michael S. Gazzaniga and published by MIT Press. This book was released on 2009-09-18 with total page 1377 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The fourth edition of The Cognitive Neurosciences continues to chart new directions in the study of the biologic underpinnings of complex cognition - the relationship between the structural and physiological mechanisms of the nervous system and the psychological reality of the mind. The material in this edition is entirely new, with all chapters written specifically for it." --Book Jacket.
Book Synopsis Aspects of Face Processing by : H.D. Ellis
Download or read book Aspects of Face Processing written by H.D. Ellis and published by Springer Science & Business Media. This book was released on 1986-06-30 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, Aberdeen, Scotland, U.K., June 29-July 4, 1985
Book Synopsis Inhibitory Interactions Between Spatial Frequency Channels in the Human Visual System by : William Howard Cushman
Download or read book Inhibitory Interactions Between Spatial Frequency Channels in the Human Visual System written by William Howard Cushman and published by . This book was released on 1976 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
