Stimulus Orientation Characteristics of Cat Visual Cortex Neurons PDF Download
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Author: Cody K. Wasner
Publisher:
ISBN:
Category :
Languages : en
Pages : 142
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Book Description
Author: Cody K. Wasner
Publisher:
ISBN:
Category :
Languages : en
Pages : 142
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Book Description
Author: Ary Sergio Sabatino Ramoa
Publisher:
ISBN:
Category :
Languages : en
Pages : 416
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Book Description
Author: Bertram Payne
Publisher: Academic Press
ISBN: 0080525326
Category : Medical
Languages : en
Pages : 733
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Book Description
Written by experts on the forefront of investigations of brain function, vision, and perception, the material presented is of an unparalleled scientific quality, and shows that analyses of enormous breadth and sophistication are required to probe the structure and function of brain regions. The articles are highly persuasive in showing what can be achieved by carrying out careful and imaginative experiments. The Cat Primary Visual Cortex should emerge as essential reading for all those interested in cerebral cortical processing of visual signals or researching or working in any field of vision. Comprehensive account of cat primary visual cortex Generous use of illustrations including color Covers research from structure to connections to functions Chapters by leaders in the field Topics presneted on multiple, compatible levels
Author: V. D. Glezer
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
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Book Description
The striation of a stimulus passing across a complex or supercomplex receptive field of a cat's visual cortex (RFVC) defines the characteristics of the field's responses. For each RF (receptive field) an optimum stimulus which evokes a maximum response can be found. The more bands there are in the optimum stimulus, the smaller is the average width of bars and the intervals between them. The effective areas of the stimulus is independent of the number of bands it contains and is equal to 2.6 degrees on the average (in diameter). The column of neurons with identical orientation of the RFs contains fields in which optimum stimuli consist of a different number of bands. These data lead one to assume that the RFVC are narrow-band filters of spatial frequencies and perform a piecewise Fourier transform of the image. A network of such neurons will discern the boundary between textures.
Author: Helga Kolb
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher: Cuvillier Verlag
ISBN: 3736907214
Category : Mathematics
Languages : de
Pages : 144
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Author: Sacha B. Nelson
Publisher:
ISBN:
Category :
Languages : en
Pages : 392
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Author: G.A. Orban
Publisher: Springer Science & Business Media
ISBN: 3642464696
Category : Medical
Languages : en
Pages : 382
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Book Description
The invitation by the editors of the series "studies of brain function" to contribute a monograph on the visual cortex gives me the opportunity to present in a concentrated manner much of the work I have done on the visual cortical areas of cat and monkey. However, the field of visual cortical physi ology is so active and so diverse that the presentation of only my own work would have given a very incomplete view of visual cortical functioning. Therefore this monograph also reviews most of the studies carried out on the subject in the last two decades. Where possible I have tried not only to describe the cortical machinery but also its possible functional purpose regarding vision. In doing this I have expressed my personal views rather than just reviewing the experimental facts. Much of the work presented in this monograph has been supported by the National Research Council of Belgium and the Research Council of the Catholic University of Leuven. I express my gratitude to them. I have en joyed collaborating in these studies with P. O. Bishop, H. Kato, H. Kennedy, K. P. Hoffmann, H. Maes, J. Duysens, E. Vandenbussche, and H. van der Glas. I am much indebted to all those who have commented on earlier versions of this monograph: J. Allman, H. Barlow, J. BuBier, M. Callens, J. Duysens, O. J. Griisser, P. Heggelund, H. Kennedy, L. C. Orban and L. Palmer.
Author: David Rose
Publisher: John Wiley & Sons
ISBN:
Category : Medical
Languages : en
Pages : 616
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Book Description
A comprehensive and stimulating study which presents the views of 71 leading theorists on the underlying mechanisms and functions of the primary visual cortex.
Author: Jonathan Lee Baker
Publisher:
ISBN:
Category : Visual cortex
Languages : en
Pages : 364
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Book Description
The mammalian visual system evolved to process and represent objects within the complexities of the natural world to appropriately guide behavior in order to ensure survival and reproduction. Visual neuroscience has long sought to understand the neural basis of these processes, but the complexity of both the visual world and the brain has traditionally required a highly reductionist approach. The classical approach has led to the development of models of visual perception that are largely based on the analysis of how single cells within the visual system respond to simple and parametrically defined visual stimuli. However our ultimate goal is to understand how the visual system operates in the natural world. The experiments and results contained in this thesis were conducted, in part, to explore the cat's visual system during the presentation of time varying natural scenes, i.e. movies, and to attempt to validate our current working models of the visual system. Novel large-scale recording methods were employed to record from and characterize responses of large populations of cat primary visual cortex neurons during classical as well as movie stimulation. Contrary to the current models and our general understanding of how visual cortex represents information, groups of adjacent neurons responded heterogeneously to the movies presented and individual responses were very brief and highly sparse in time. The diversity and dynamics of the spiking activity was also significantly correlated with fluctuations of the ongoing local field potentials, specifically within the gamma frequency band, ranging from 25 to 90Hz. These gamma band oscillations also exhibited rich spatiotemporal dynamics throughout the movie presentations. In conclusion, time-varying natural scenes evoke response dynamics within the cat primary visual cortex not typically observed under more classical stimulus regimes. Future experimentation and the construction of biologically feasible models of visual cortex should take into account the diversity of responses observed under more natural stimulus conditions.
