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Brain damage may sometimes cause specific impairments in human behaviour. One rare impairment is the failure to recognize everyday objects by sight, a problem which is termed "visual agnosia". In this book, the authors discuss the case of a patient,
Vision allows us to do many things. It enables us to perceive a world composed of meaningful objects and events. It enables us to track those events as they take place in front of our eyes. It enables us to read. It provides accurate spatial information for actions such as reaching for or avoiding objects. It provides colour and texture that can help us to separate objects from their background, and so forth. This book is concerned with understanding the processes that allow us to carry out these various visually driven behaviours. In the past ten years our understanding of visual processing has undergone a rapid change, primarily fostered by the convergence of computational, experimental an...
Visual agnosia is a rare but fascinating disorder of visual object recognition that can occur after a brain lesion. This book documents the case of John, who worked intensively with the authors for 26 years after acquiring visual agnosia following a stroke. It revisits John’s case over twenty years after it was originally described in the book To See But Not To See, in 1987. As in the previous book, the condition is illuminated by John and his wife, Iris, in their own words. A Case Study in Visual Agnosia Revisited discusses John’s case in the context of research into the cognitive neuroscience of vision over the past twenty years. It shows how John’s problems in recognition can provid...
The case study of John has provided a unique insight into the nature of visual agnosia and more broadly into the underlying processes which support human vision. After suffering a stroke, John had problems in recognizing common objects, faces, seeing colours, reading and finding his way around his environment. A Reader in Visual Agnosia brings together the primary scientific papers describing the detailed investigations for each visual problem which the authors carried out with John, known as patient HJA. This work was summarised initially in To See But Not To See (1987), and 26 years later in A Case Study in Visual Agnosia Revisited (2013). The chapters are divided into 6 parts corresponding to the key areas of investigation: Integrative visual agnosia Perception of global form Face perception Colour perception Word recognition Changes over time Each part contains a short introduction, written by the two leading researchers who worked with John, which highlights the relations between the papers and demonstrates the pathway of the case analysis. The book will be invaluable to students and researchers in visual cognition, cognitive neuropsychology and vision neuroscience.
The chapters in this new book span the range of reading processes from early visual analysis to semantic influences on word identification, thus providing a state-of-the-art summary of current work and offering important contributions to prospective reading research. Basic Processes in Reading examines both future plans and past accomplishments in the world of word identification research. Three chapters provide a futuristic view taking a parallel distributed processing approach to semantic priming, phonology, and the identification of old words and the learning of new words. Reviews on eye movements in reading and semantic priming on word identification provide a retrospective summary of work on these issues as well as solid pointers for future investigations. Other chapters provide new demonstrations of the importance of phonological contributions to word identification, of interactive processes in the identification of handwritten words, and a re-evaluation of the processes involved in the neuropsychological syndrome described as "letter-by-letter" reading.
To generate coherent behavior, the brain needs to attend selectively to the many objects that are present in the environment, but this poses several questions. How does the brain know which objects 'belong together'? How does the information from different senses get combined? How does this help to plan and carry out actions? The subject of attentional mechanisms has a long history in cognitive psychology, as it is the key to making sense of the visual world. However, new developments in cognitive neuroscience, and greater understanding of how attention and action are integrated, have transformed the field. This book is the first to bring together leading researchers to discuss the convergence of experimental findings in the following areas: visual selective attention, attention and perceptual integration, spatial representation and attention, visual attention and action, and control of attention. Attention, Space, and Action provides a unique combination of perspectives that will appeal to students and researchers from psychology, neuropsychology, neurophysiology, and neuroanatomy.
This state-of-the-art handbook provides an authoritative overview of the field of perception, with special emphasis on new developments and trends. Surveys the entire field of perception, including vision, hearing, taste, olfaction, and cutaneous sensibility. Ideal for researchers and teachers looking for succinct, state-of-the-art overviews of areas outside their speciality, and for anyone wanting to know about current research and future trends. Uses a tutorial approach that results in a balanced description of topics. A 'Selected Readings' section points to general references that provide more detailed treatments of each topic; 'Additional Topics' provide references to important topics. Written by noted authorities in the field. Now available in full text online via xreferplus, the award-winning reference library on the web from xrefer. For more information, visit www.xreferplus.com
Originally published in 1987, this book, attempted to bring together work by researchers concerned with the functional and neurological mechanisms underlying visual object processing, and the ways in which such mechanisms can be neurologically impaired. The editors termed it a ‘Cognitive Neuropsychological’ approach, because they believed it tried to relate evidence from neurological impairments of visual object processing to models of normal performance in a new and important way. Two broad aims are apparent. One is to test models of normal performance by evaluating how well the models account for the patterns of impairment and preservation of abilities that can occur following brain damage. The other is to use models of normal performance to further their understanding of acquired disorders of visual object processing. These aims distinguish the approach from neuropsychological work whose primary aim is to relate acquired deficits to the sites of damage, and from work in the field of cognitive psychology which attempts only to develop models of normal performance.
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The Neuropsychology of Vision describes a range of exciting new approaches to neuropsychological investigation and provides a broad overview of visual neuropsychology. The book starts by examining the neural basis of perception - presenting important new research using single-unit recordings. Recent work using these methods has shown how the visual system relies strongly on feedback from higher to lower levels of information processing, and that neural plasticity exists in the primary sensory cortices of adults, areas previously thought to be hard-wired. The book also considers disturbances of visual perception such as agnosia, neglect, blindsight, and achromatopsia, describing what we now know about recovery and rehabilitation from cerebral visual disorders. Throughout, the book refers to new and adapted techniques for measuring brain activity, including multi-unit sum potential recording, fMRI, and transcranial magnetic stimulation. With contributions from leading scientists in the vision sciences, this book provides a state-of-the-art review of the topic. Book jacket.