Effects Of Attention On Physiological Responses In Human Visual Cortex
DOWNLOAD
Download Effects Of Attention On Physiological Responses In Human Visual Cortex PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Effects Of Attention On Physiological Responses In Human Visual Cortex book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Effects Of Attention On Physiological Responses In Human Visual Cortex
DOWNLOAD
Author : Erik Runeson
language : en
Publisher:
Release Date : 2013
Effects Of Attention On Physiological Responses In Human Visual Cortex written by Erik Runeson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Attention categories.
Behavioral performance often suffers when attention is divided across multiple visual items. These results are supported by fMRI experiments showing reduced responses during divided attention, relative to focused attention, in primary visual cortex. However, a subset of behavioral research on divided attention suggests that the costs of dividing attention are dependent on task complexity and stimulus type. For example, costs are typically minimal when searching for a constant target that is defined by simple features such as orientation or contrast. Here we show fMRI evidence in humans that shows no cost of dividing attention in a task that incorporates simple search, on responses in primary visual cortex. Observers determined whether or not a vertically oriented low-contrast Gabor patch was present within one or four relevant locations. All four locations were always occupied by horizontally oriented Gabor pedestals, and the probability of a target being present was independent across trials and locations. Only the number of relevant locations varied across conditions. We found that the BOLD signal measured from human V1 was not reduced by divided attention when the task and stimuli are simple, suggesting that neural processing of simple features in primary visual cortex has unlimited capacity, corroborating a recent finding in monkeys (Chen and Seidemann, 2012). Multiple visual tasks can be performed on the same visual input, with different tasks presumably engaging different neuronal populations. The modular layout of the visual system implies that specific cortical regions carry more information about certain stimulus attributes than others. Thus, it is reasonable to assume that decisions during a task will be optimal if they are based on the responses of the most informative neuronal signals, which presumably originate in regions with the sharpest tuning for the relevant stimulus feature. Previous studies have supported this position. Here we present the results of two fMRI experiments that confirm these findings and expand on earlier investigations by addressing the effects of the physical properties of an attended stimulus on task-related modulations in human visual cortex. Specifically, we ask whether performing two-alternative forced choice speed- and color-discrimination tasks (and other attentional processes) can modulate neural activity independent of visual stimulation, and whether the effect of spatial attention depends on which task is being performed. The results indicate that, (1) when stimulation and spatial attention are constant, responses in V4 and MT+ depend on the task being performed, and are independent of the tested physical properties of the selected stimulus, (2) this task-dependent modulation might require a stimulus - task-specific preparatory mechanisms alone are not sufficient to drive responses, and (3) independent of which task is being performed, spatial attention adds a baseline shift to responses in MT+ and V4 when a stimulus is present.
Global Effects Of Attention In Human Visual Cortex
DOWNLOAD
Author : Melissa Saenz
language : en
Publisher:
Release Date : 2002
Global Effects Of Attention In Human Visual Cortex written by Melissa Saenz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Neurobiology Of Attention
DOWNLOAD
Author : Laurent Itti
language : en
Publisher: Elsevier
Release Date : 2005-03-31
Neurobiology Of Attention written by Laurent Itti and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-03-31 with Psychology categories.
A key property of neural processing in higher mammals is the ability to focus resources by selectively directing attention to relevant perceptions, thoughts or actions. Research into attention has grown rapidly over the past two decades, as new techniques have become available to study higher brain function in humans, non-human primates, and other mammals. Neurobiology of Attention is the first encyclopedic volume to summarize the latest developments in attention research.An authoritative collection of over 100 chapters organized into thematic sections provides both broad coverage and access to focused, up-to-date research findings. This book presents a state-of-the-art multidisciplinary perspective on psychological, physiological and computational approaches to understanding the neurobiology of attention. Ideal for students, as a reference handbook or for rapid browsing, the book has a wide appeal to anybody interested in attention research. * Contains numerous quick-reference articles covering the breadth of investigation into the subject of attention* Provides extensive introductory commentary to orient and guide the reader* Includes the most recent research results in this field of study
Vision And Attention
DOWNLOAD
Author : Michael Jenkin
language : en
Publisher: Springer
Release Date : 2001-06-01
Vision And Attention written by Michael Jenkin and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-06-01 with Medical categories.
This is at once a review and a summary of the tremendous advances that have been made in recent years on the effect of attention on visual perception. This broad-ranging volume will appeal to vision scientists as well as to those involved in using visual processes in computer animations, display design or the sensory systems of machines. Physiologists and neuroscientists interested in any aspect of sensory or motor processes will also find it very useful.
The Neural Consequences Of Reflexive Attention In Human Visual Cortex
DOWNLOAD
Author : Joseph Bernard Hopfinger
language : en
Publisher:
Release Date : 1998
The Neural Consequences Of Reflexive Attention In Human Visual Cortex written by Joseph Bernard Hopfinger and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Effects Of Visual Attention On Stereoscopic Depth Perception In The Human Visual Cortex
DOWNLOAD
Author : Ifan Betina Ip
language : en
Publisher:
Release Date : 2010
Effects Of Visual Attention On Stereoscopic Depth Perception In The Human Visual Cortex written by Ifan Betina Ip and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Attention categories.
Psychophysiology
DOWNLOAD
Author : John L. Andreassi
language : en
Publisher: Psychology Press
Release Date : 2010-05-26
Psychophysiology written by John L. Andreassi and has been published by Psychology Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-05-26 with Medical categories.
Psychophysiology: Human Behavior and Physiological Response provides students with essential elementary information regarding the anatomy and physiology of various body systems, recording techniques, integrative reviews of literature, and concepts
Psychophysiology
DOWNLOAD
Author : John L. Andreassi
language : en
Publisher: Psychology Press
Release Date : 2013-07-23
Psychophysiology written by John L. Andreassi and has been published by Psychology Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-07-23 with Psychology categories.
This highly readable and comprehensive overview of psychophysiology provides information regarding the anatomy and physiology of various body systems, methods of recording their activity, and ways in which these measures relate to human behavior. Biofeedback applications are contained in a separate chapter and discussions of stress management, job strain, and personality factors that affect cardiovascular reactivity are presented. There is much of interest here to the student, researcher, and clinician in behavioral medicine, ergonomics, emotion, cognitive neuroscience, neuropsychology, and health psychology. Now in its fourth edition, Andreassi's Psychophysiology explores some of the newer areas of importance and updates findings in traditional topics of interest. Significant changes to this edition include: updated information on brain activity in memory, perception, and intelligence; new information on brain imaging and behavior; separate chapters on pupillography and eye movements; new information on the startle pattern and eyeblink; separate chapters on clinical and non-clinical applications; updated information on cardiovascular reactivity and personality; the latest biofeedback and ergonomics applications; novel findings in environmental psychophysiology; brief summaries at the end of each section; and an appendix on laboratory safety Each chapter is a self-contained unit allowing instructors to customize the presentation of the material. With over 1,700 citations, Andreassi's Psychophysiology is the definitive text in the field. An instructor's manual is now available. Based on the book, the manual is primarily a test bank to be used in giving examinations to students during the teaching of a course. Both multiple-choice and essay questions have been provided, along with lists of key terms and ideas. These can be used for definition-type questions and to highlight important concepts, as well as alerting the instructor to important terms and ideas that they may want to cover in lectures. Sample syllabi are provided for teaching a course at both undergraduate and graduate levels to help the instructor who is preparing a course for the first time. A number of possible laboratory exercises are also provided that can be carried out in conjunction with teaching the course.
States Of Brain And Mind
DOWNLOAD
Author : HOBSON
language : en
Publisher: Birkhäuser
Release Date : 2013-12-19
States Of Brain And Mind written by HOBSON and has been published by Birkhäuser this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-19 with Science categories.
Discovering The Brain
DOWNLOAD
Author : National Academy of Sciences
language : en
Publisher: National Academies Press
Release Date : 1992-01-01
Discovering The Brain written by National Academy of Sciences and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992-01-01 with Medical categories.
The brain ... There is no other part of the human anatomy that is so intriguing. How does it develop and function and why does it sometimes, tragically, degenerate? The answers are complex. In Discovering the Brain, science writer Sandra Ackerman cuts through the complexity to bring this vital topic to the public. The 1990s were declared the "Decade of the Brain" by former President Bush, and the neuroscience community responded with a host of new investigations and conferences. Discovering the Brain is based on the Institute of Medicine conference, Decade of the Brain: Frontiers in Neuroscience and Brain Research. Discovering the Brain is a "field guide" to the brainâ€"an easy-to-read discussion of the brain's physical structure and where functions such as language and music appreciation lie. Ackerman examines: How electrical and chemical signals are conveyed in the brain. The mechanisms by which we see, hear, think, and pay attentionâ€"and how a "gut feeling" actually originates in the brain. Learning and memory retention, including parallels to computer memory and what they might tell us about our own mental capacity. Development of the brain throughout the life span, with a look at the aging brain. Ackerman provides an enlightening chapter on the connection between the brain's physical condition and various mental disorders and notes what progress can realistically be made toward the prevention and treatment of stroke and other ailments. Finally, she explores the potential for major advances during the "Decade of the Brain," with a look at medical imaging techniquesâ€"what various technologies can and cannot tell usâ€"and how the public and private sectors can contribute to continued advances in neuroscience. This highly readable volume will provide the public and policymakersâ€"and many scientists as wellâ€"with a helpful guide to understanding the many discoveries that are sure to be announced throughout the "Decade of the Brain."