Download or read book Learning to see better improving visual deficits with perceptual learning written by Gianluca Campana and published by Frontiers Media SA. This book was released on 2015-07-09 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perceptual learning can be defined as a long lasting improvement in a perceptual skill following a systematic training, due to changes in brain plasticity at the level of sensory or perceptual areas. Its efficacy has been reported for a number of visual tasks, such as detection or discrimination of visual gratings (De Valois, 1977; Fiorentini & Berardi, 1980, 1981; Mayer, 1983), motion direction discrimination (Ball & Sekuler, 1982, 1987; Ball, Sekuler, & Machamer, 1983), orientation judgments (Fahle, 1997; Shiu & Pashler, 1992; Vogels & Orban, 1985), hyperacuity (Beard, Levi, & Reich, 1995; Bennett & Westheimer, 1991; Fahle, 1997; Fahle & Edelman, 1993; Kumar & Glaser, 1993; McKee & Westheimer, 1978; Saarinen & Levi, 1995), visual search tasks (Ahissar & Hochstein, 1996; Casco, Campana, & Gidiuli, 2001; Campana & Casco, 2003; Ellison & Walsh, 1998; Sireteanu & Rettenbach, 1995) or texture discrimination (Casco et al., 2004; Karni & Sagi, 1991, 1993). Perceptual learning is long-lasting and specific for basic stimulus features (orientation, retinal position, eye of presentation) suggesting a long-term modification at early stages of visual analysis, such as in the striate (Karni & Sagi, 1991; 1993; Saarinen & Levi, 1995; Pourtois et al., 2008) and extrastriate (Ahissar & Hochstein, 1996) visual cortex. Not confined to a basic research paradigm, perceptual learning has recently found application outside the laboratory environment, being used for clinical treatment of a series of visually impairing conditions such as amblyopia (Levi & Polat, 1996; Levi, 2005; Levi & Li, 2009, Polat et al., 2004; Zhou et al., 2006), myopia (Tan & Fong, 2008) or presbyopia (Polat, 2009). Different authors adopted different paradigms and stimuli in order to improve malfunctioning visual abilities, such as Vernier Acuity (Levi, Polat & Hu, 1997), Gratings detection (Zhou et al., 2006), oculomotor training (Rosengarth et al., 2013) and lateral interactions (Polat et al., 2004). The common result of these studies is that a specific training produces not only improvements in trained functions, but also in other, untrained and higher-level visual functions, such as visual acuity, contrast sensitivity and reading speed (Levi et al, 1997a, 1997b; Polat et al., 2004; Polat, 2009; Tan & Fong, 2008). More recently (Maniglia et al. 2011), perceptual learning with the lateral interactions paradigm has been successfully used for improving peripheral vision in normal people (by improving contrast sensitivity and reducing crowding, the interference in target discrimination due to the presence of close elements), offering fascinating new perspectives in the rehabilitation of people who suffer of central vision loss, such as maculopathy patients, partially overcoming the structural differences between fovea and periphery that limit the vision outside the fovea. One of the strongest point, and a distinguishing feature of perceptual learning, is that it does not just improve the subject’s performance, but produces changes in brain’s connectivity and efficiency, resulting in long-lasting, enduring neural changes. By tailoring the paradigms on each subject’s needs, perceptual learning could become the treatment of choice for the rehabilitation of visual functions, emerging as a simple procedure that doesn’t need expensive equipment.
Download or read book Learning to See better Improving Visual Deficits with Perceptual Learning written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perceptual learning can be defined as a long lasting improvement in a perceptual skill following a systematic training, due to changes in brain plasticity at the level of sensory or perceptual areas. Its efficacy has been reported for a number of visual tasks, such as detection or discrimination of visual gratings (De Valois, 1977; Fiorentini & Berardi, 1980, 1981; Mayer, 1983), motion direction discrimination (Ball & Sekuler, 1982, 1987; Ball, Sekuler, & Machamer, 1983), orientation judgments (Fahle, 1997; Shiu & Pashler, 1992; Vogels & Orban, 1985), hyperacuity (Beard, Levi, & Reich, 1995; Bennett & Westheimer, 1991; Fahle, 1997; Fahle & Edelman, 1993; Kumar & Glaser, 1993; McKee & Westheimer, 1978; Saarinen & Levi, 1995), visual search tasks (Ahissar & Hochstein, 1996; Casco, Campana, & Gidiuli, 2001; Campana & Casco, 2003; Ellison & Walsh, 1998; Sireteanu & Rettenbach, 1995) or texture discrimination (Casco et al., 2004; Karni & Sagi, 1991, 1993). Perceptual learning is long-lasting and specific for basic stimulus features (orientation, retinal position, eye of presentation) suggesting a long-term modification at early stages of visual analysis, such as in the striate (Karni & Sagi, 1991; 1993; Saarinen & Levi, 1995; Pourtois et al., 2008) and extrastriate (Ahissar & Hochstein, 1996) visual cortex. Not confined to a basic research paradigm, perceptual learning has recently found application outside the laboratory environment, being used for clinical treatment of a series of visually impairing conditions such as amblyopia (Levi & Polat, 1996; Levi, 2005; Levi & Li, 2009, Polat et al., 2004; Zhou et al., 2006), myopia (Tan & Fong, 2008) or presbyopia (Polat, 2009). Different authors adopted different paradigms and stimuli in order to improve malfunctioning visual abilities, such as Vernier Acuity (Levi, Polat & Hu, 1997), Gratings detection (Zhou et al., 2006), oculomotor training (Rosengarth et al., 2013) and lateral interactions (Polat et al., 2004). The common result of these studies is that a specific training produces not only improvements in trained functions, but also in other, untrained and higher-level visual functions, such as visual acuity, contrast sensitivity and reading speed (Levi et al, 1997a, 1997b; Polat et al., 2004; Polat, 2009; Tan & Fong, 2008). More recently (Maniglia et al. 2011), perceptual learning with the lateral interactions paradigm has been successfully used for improving peripheral vision in normal people (by improving contrast sensitivity and reducing crowding, the interference in target discrimination due to the presence of close elements), offering fascinating new perspectives in the rehabilitation of people who suffer of central vision loss, such as maculopathy patients, partially overcoming the structural differences between fovea and periphery that limit the vision outside the fovea. One of the strongest point, and a distinguishing feature of perceptual learning, is that it does not just improve the subject's performance, but produces changes in brain's connectivity and efficiency, resulting in long-lasting, enduring neural changes. By tailoring the paradigms on each subject's needs, perceptual learning could become the treatment of choice for the rehabilitation of visual functions, emerging as a simple procedure that doesn't need expensive equipment.
Download or read book Perceptual Learning written by Barbara Dosher and published by MIT Press. This book was released on 2020-10-13 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive and integrated introduction to the phenomena and theories of perceptual learning, focusing on the visual domain. Practice or training in perceptual tasks improves the quality of perceptual performance, often by a substantial amount. This improvement is called perceptual learning (in contrast to learning in the cognitive or motor domains), and it has become an active area of research of both theoretical and practical significance. This book offers a comprehensive introduction to the phenomena and theories of perceptual learning, focusing on the visual domain. Perceptual Learning explores the tradeoff between the competing goals of system stability and system adaptability, signal and noise, retuning and reweighting, and top-down versus bottom-down processes. It examines and evaluates existing research and potential future directions, including evidence from behavior, physiology, and brain imaging, and existing perceptual learning applications, with a focus on important theories and computational models. It also compares visual learning to learning in other perceptual domains, and considers the application of visual training methods in the development of perceptual expertise and education as well as in remediation for limiting visual conditions. It provides an integrated treatment of the subject for students and researchers and for practitioners who want to incorporate perceptual learning into their practice.Practice or training in perceptual tasks improves the quality of perceptual performance, often by a substantial amount. This improvement is called perceptual learning, in contrast with learning in the cognitive or motor domains. Perceptual learning has been a very active area of research of both theoretical and practical interest. Research on perceptual learning is of theoretical significance in illuminating plasticity in adult perceptual systems, and in understanding the limitations of human information processing and how to improve them. It is of practical significance as a potential method for the development of perceptual expertise in the normal population, for its potential in advancing development and supporting healthy aging, and for noninvasive amelioration of deficits in challenged populations by training. Perceptual learning has become an increasingly important topic in biomedical research. Practitioners in this area include science disciplines such as psychology, neuroscience, computer sciences, and optometry, and developers in applied areas of learning game design, cognitive development and aging, and military and biomedical applications. Commercial development of training products, protocols, and games is a multi-billion dollar industry. Perceptual learning provides the basis for many of the developments in these areas. This book is written for anyone who wants to understand the phenomena and theories of perceptual learning or to apply the technology of perceptual learning to the development of training methods and products. Our aim is to provide an introduction to those researchers and students just entering this exciting field, to provide a comprehensive and integrated treatment of the phenomena and the theories of perceptual learning for active perceptual learning researchers, and to describe and develop the basic techniques and principles for readers who want to successfully incorporate perceptual learning into applied developments. The book considers the special challenges of perceptual learning that balance the competing goals of system stability and system adaptability. It provides a systematic treatment of the major phenomena and models in perceptual learning, the determinants of successful learning and of specificity and transfer. The book provides a cohesive consideration of the broad range of perceptual learning through the theoretical framework of incremental learning of reweighting evidence that supports successful task performance. It provides a detailed analysis of the mechanisms by which perceptual learning improves perceptual limitations, the relationship of perceptual learning and the critical period of development, and the semi-supervised modes of learning that dominate perceptual learning. It considers limitations and constraints on learning multiple tasks and stimuli simultaneously, the implications of training at high or low levels of performance accuracy, and the importance of feedback to perceptual learning. The basis of perceptual learning in physiology is discussed along with the relationship of visual perceptual learning to learning in other sensory domains. The book considers the applications of perceptual learning in the development of expertise, in education and gaming, in training during development and aging, and applications to remediation of mental health and vision disorders. Finally, it applies the phenomena and models of perceptual learning to considerations of optimizing training.
Download or read book Making Eye Health a Population Health Imperative written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-01-15 with total page 587 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to see deeply affects how human beings perceive and interpret the world around them. For most people, eyesight is part of everyday communication, social activities, educational and professional pursuits, the care of others, and the maintenance of personal health, independence, and mobility. Functioning eyes and vision system can reduce an adult's risk of chronic health conditions, death, falls and injuries, social isolation, depression, and other psychological problems. In children, properly maintained eye and vision health contributes to a child's social development, academic achievement, and better health across the lifespan. The public generally recognizes its reliance on sight and fears its loss, but emphasis on eye and vision health, in general, has not been integrated into daily life to the same extent as other health promotion activities, such as teeth brushing; hand washing; physical and mental exercise; and various injury prevention behaviors. A larger population health approach is needed to engage a wide range of stakeholders in coordinated efforts that can sustain the scope of behavior change. The shaping of socioeconomic environments can eventually lead to new social norms that promote eye and vision health. Making Eye Health a Population Health Imperative: Vision for Tomorrow proposes a new population-centered framework to guide action and coordination among various, and sometimes competing, stakeholders in pursuit of improved eye and vision health and health equity in the United States. Building on the momentum of previous public health efforts, this report also introduces a model for action that highlights different levels of prevention activities across a range of stakeholders and provides specific examples of how population health strategies can be translated into cohesive areas for action at federal, state, and local levels.
Download or read book Crowding in Children with Visual Impairment written by Antonius Henricus Nicolaas Cillessen and published by . This book was released on 2014 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Developing Ocular Motor and Visual Perceptual Skills written by Kenneth A. Lane and published by SLACK Incorporated. This book was released on 2005 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Developing Ocular Motor and Visual Perceptual Skills contains daily lesson plans and practical tips on how to successfully start an activities program. Other helpful features include a glossary of terms and a reference list of individuals and organizations that work with learning disabled children to develop these skills. The first of its kind, Developing Ocular Motor and Visual Perceptual Skills utilizes a learning approach by linking the theories with the remediation activities to help learning disabled children improve their perceptual and fine motor skills. All professionals looking to assess and enhance a variety of fine motor and visual perception deficiencies will welcome this workbook into their practices" -- Publisher description.
Download or read book Perceptual Learning written by Manfred Fahle and published by MIT Press. This book was released on 2002 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perceptual learning is the specific and relatively permanent modification of perception and behaviour following sensory experience. This book presents advances made during the 1990s in this rapidly growing field.
Download or read book Developing Ocular Motor and Visual Perceptual Skills written by Kenneth Lane and published by Taylor & Francis. This book was released on 2024-06-01 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: With over 20 years of experience, Dr. Kenneth A. Lane has designed Developing Ocular Motor and Visual Perceptual Skills: An Activity Workbook to help occupational therapists, optometrists, and other professionals develop the ocular motor and visual perceptual skills of learning disabled children. To establish a framework for understanding, each chapter begins with the scientific theories used to develop the activity forms. Insightful suggestions are included on how to solidify the program's success. The easy-to-follow activity forms are then presented, along with numerous illustrations that help develop ocular motor and visual perceptual skills. The forms are divided into as many as five levels of difficulty so both children and teenagers can benefit from each activity. Developing Ocular Motor and Visual Perceptual Skills contains daily lesson plans and practical tips on how to successfully start an activities program. Other helpful features include a glossary of terms and a reference list of individuals and organizations that work with learning disabled children to develop these skills. The first of its kind, Developing Ocular Motor and Visual Perceptual Skills utilizes a learning approach by linking the theories with the remediation activities to help learning disabled children improve their perceptual and fine motor skills. All professionals looking to assess and enhance a variety of fine motor and visual perception deficiencies will welcome this workbook into their practices. Topics include: Complexity of reading Ocular motor Gross motor Visual-motor perception Visual memory Laterality Reversals
Download or read book Exploring the Extent of Training induced Visual Plasticity and the Potential for Use in Visual Rehabilitation written by Asmara Awada and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "In humans, vision represents the dominant source of sensory information about the external world, with more than half of the brain dedicated to the processing of visual information. Vision loss can thus be extremely devastating, with major impacts on quality of life. One of the most prevalent causes for visual deficit is stroke. Indeed, around 15 million people suffer a stroke every year with 30-50% of the cases associated with visual deficits. While two-thirds of stroke patients survive, the majority require months, or even years, of rehabilitation. However, to date, no clinically validated strategies exist to recover vision after stroke. However, the visual cortex remains highly plastic throughout the lifespan and can be retrained and reorganized to improve specific visual functions in a process known as visual perceptual learning. As a manifestation of pervasive plasticity occurring in the adult visual cortex, visual perceptual learning has a significant practical implication, providing high promise for use in visual rehabilitation. However, research in the field has identified a characteristic sensory specificity that limits its practical use. Recent advances have thus been devoted to exploring the neural basis of visual perceptual learning and to accordingly develop strategies that can overcome the sensory specificity. However, it remains unknown whether visual perceptual learning also exhibits effector specificity, imposing a larger limit on its practical use, and accordingly, whether non-specific recovery of visual function can be retrained in stroke patients. In Chapter 3 of this thesis, we show that while sensory specificity is prevalent in visual perceptual learning, effector specificity is not exhibited, providing increased promise for use in rehabilitation. In Chapter 4 of this thesis, we show that some visual function can be retrained in stroke patients through perceptual learning, but that a limit to recovery seems to exist. Overall, the findings of this thesis shed light on the nature of visual perceptual learning. Indeed, we provide evidence supporting the notion that perceptual learning represents a functional reorganization of visual information in parietal cortices but that the mechanism seems to be different in damaged cortices, limiting the kind of improvement that can be attained through training"--
Download or read book Amblyopia written by Kenneth J. Ciuffreda and published by Butterworth-Heinemann. This book was released on 1991 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text aims to satisfy the needs of the optometry student taking courses in amblyopia and abnormal binocular vision, update the information critical to the work of the experienced clinician, and provide the vision researcher working in this area with a comprehensive overview of the topic.
Download or read book Microperimetry and Multimodal Retinal Imaging written by Edoardo Midena and published by Springer Science & Business Media. This book was released on 2013-12-12 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microperimetry allows precise functional examination of the retina and optic nerve and is especially valuable for evaluation of the macular area. This fully up-to-date textbook on microperimetry, written by leading experts in the field, will also serve as an atlas and diagnostic reference. It is designed for use by both ophthalmologists and optometrists in daily clinical practice and clinical research, and the contents thus range from basic technical information to the most advanced clinical applications. Past and current microperimetry techniques are reviewed, and the role of microperimetry in the context of multimodal imaging scenario is explained. The full range of clinical applications is then discussed, including age-related macular degeneration, diabetes, myopia, retinal dystrophies, disorders of the vitreoretinal interface, inflammatory chorioretinal diseases, toxic retinopathies, glaucoma, and low vision.
Download or read book Visual Perception Problems in Children with AD HD Autism and Other Learning Disabilities written by Lisa A. Kurtz and published by Jessica Kingsley Publishers. This book was released on 2006 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of vision problems in children with developmental disabilities such as AD/HD and specific learning disabilities. It is appropriate for parents and professionals alike and offers non-technical explanations of how vision difficulties are screened for and advice on where to seek appropriate professional care.
Download or read book Visual Reflections written by Michael McCloskey and published by . This book was released on 2009-04-30 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: How much can we learn about normal visual perception and cognition from a malfunctioning visual system? Quite a lot, as Michael McCloskey makes abundantly clear in this book. McCloskey presents his work with AH, a college student who has an extraordinary deficit in visual perception. When AH looks at an object, she sees it clearly and identifies it readily; yet she is often dramatically mistaken about where the object is or how it is oriented. For example, she may reach out to grasp an object that she sees on her left, but miss it completely because it is actually on her right; or she may see an arrow pointing up when it is really pointing down. AH's errors, together with many other clues, lead McCloskey to some very interesting conclusions about how we perceive the world. He develops theoretical claims about visual subsystems, the nature of visual location and orientation representations, attention and spatial representations, the role of the visual system in mental imagery, and the levels of the visual system implicated in awareness. Visual Reflections makes a fascinating and compelling case that we can often learn more about a process when it goes awry than when it functions flawlessly.
Download or read book Optometric Management of Learning related Vision Problems written by Mitchell Scheiman and published by Elsevier Health Sciences. This book was released on 2006-01-01 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the relationship between vision and learning and the role of optometrists in the assessment and management of learning related vision problems. It discusses normal child development, the learning process, learning disabilities, the relationship between vision and learning, and models for managing vision problems affecting learning. It is also of interest to health care practitioners involved in the evaluation and treatment of children and adults with learning difficulties. Instructor resources are available; please contact your Elsevier sales representative for details. Presents an organized, easy-to-follow approach to the diagnosis and treatment of learning-related vision problems.Each chapter contains key terms and chapter review questions making it more appealing to the student and instructor.Includes appendices containing sample reports, sample questionnaires, sample letters, a bibliography, and case histories showing the reader how to use the material from the book in practice.Well respected authors and contributors provide authoritative coverage of the topic. Expanded information on the use of colored lenses and reading.New chapter on reading disorders that covers how children learn to read, teaching methods, optometric assessment, and management of dyslexia.Chapters have been updated with new computer software options, including computer aided vision therapy, perceptual home therapy system, and temporal visual processing program.Updated testing battery, including new tests, visual processing speed, and optometric use of IQ screening tests such as K-BIT.Expanded coverage of psycho education evaluation includes substantial updates with new test instruments, such as WISC.Substantial revisions based on literature review for last 10 years.New and updated illustrations.
Download or read book Visual Impairments written by National Research Council and published by National Academies Press. This book was released on 2002-08-17 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: When children and adults apply for disability benefits and claim that a visual impairment has limited their ability to function, the U.S. Social Security Administration (SSA) is required to determine their eligibility. To ensure that these determinations are made fairly and consistently, SSA has developed criteria for eligibility and a process for assessing each claimant against the criteria. Visual Impairments: Determining Eligibility for Social Security Benefits examines SSA's methods of determining disability for people with visual impairments, recommends changes that could be made now to improve the process and the outcomes, and identifies research needed to develop improved methods for the future. The report assesses tests of visual function, including visual acuity and visual fields whether visual impairments could be measured directly through visual task performance or other means of assessing disability. These other means include job analysis databases, which include information on the importance of vision to job tasks or skills, and measures of health-related quality of life, which take a person-centered approach to assessing visual function testing of infants and children, which differs in important ways from standard adult tests.
Download or read book Ophthalmology written by Pinakin Davey and published by BoD – Books on Demand. This book was released on 2014-09-03 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together both a review and updates in clinical and research areas. The chapters will be of interest to a wide audience. On one hand, the review and update of clinical practices will interest students and residents, on the other, cutting edge research chapters will be of interest to the researchers in the field. The book is divided into four parts: 1) Review and Updates in Diagnostic Testing, 2) Updates in Anterior Segment Diseases, 3) Updates in Posterior Segment Diseases, and 4) Updates in Research in Ophthalmology, Optometry and Vision Science. The chapters are written by experts and individuals with special interests in topics with a focus on clinical application and translational benefit to eye care.
Download or read book Visual Attention in Children written by Kenneth A. Lane and published by SLACK Incorporated. This book was released on 2012 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: In typical child development, attention controls many aspects of learning, including memory, motor control, and problem solving. Attention organizes the constant influx of information that needs to be absorbed by children. Inside Visual Attention in Children: Theories and Activities, Dr. Kenneth A. Lane describes the positive aspects of attention that are needed for children to be successful in the classroom, such as concentration and vigilance, as opposed to negative aspects that can lead to failure, such as distractibility and confusion. This book is divided into two parts. The first eight chapters of the book explain attention and its relationship to vision and visual stimuli. The core topics discussed here include Autism, ADHD, Dyslexia, Executive Function, and Memory. The second half outlines a Vision Therapy program and consists of activities for improving visual attention in children. Over 100 activities are explained and illustrated. Visual Attention in Children: Theories and Activities is anchored on current theories in five areas of attention that shape child development. Theories Described Include: * Focused Attention - The ability to respond discreetly to visual, auditory, and tactile stimuli * Selective Attention - The ability to maintain behavioral or cognitive abilities in the face of distracting or competing stimuli * Shifting Attention - The ability to rapidly shift attention from one object to another * Sustained Attention - The ability to maintain a consistent behavioral response during a continuous or repetitive activity * Divided Attention -The ability to engage in more than one attention-focused task at one time. Visual Attention in Children: Theories and Activities is the perfect tool for occupational therapy students and clinicians as well as other professionals specializing in child development and learning who are looking to enhance their understanding of this topic and who need unique ideas and activities to add to their visual therapy training programs.
