6 edition of The Cat Primary Visual Cortex found in the catalog.
by Academic Press
|Contributions||Bertram Payne (Editor), Alan Peters (Editor)|
|The Physical Object|
|Number of Pages||725|
Primary visual cortex (V1) is the site at which orientation selectivity emerges in mammals: visual thalamus afferents to V1 respond equally to all stimulus orientations, whereas their target V1 neurons respond selectively to stimulus orientation. The emergence of orientation selectivity in V1 has long served as a model for investigating cortical :// We previously suggested that orientation-tuned surround suppression of responses of cells in the primary visual cortex (V1) is primarily caused by a decrease in geniculocortical input for the cell [Ozeki H, Sadakane O, Akasaki T, Naito T, Shimegi S, Sato H () Relationship between excitation and inhibition underlying size tuning and contextual response modulation in the cat primary visual
Immediately after focal retinal lesions, receptive fields (RFs) in primary visual cortex expand considerably, even when the retinal damage is limited to the photoreceptor layer. The time course of these changes suggests that mere lack of stimulation in the vicinity of the RF accompanied by stimulation in the surrounding region causes the RF expansion. While recording from single cells in cat The process of orientation tuning is an important and well-characterized feature of neurons in primary visual cortex. The combination of ascending and descending circuits involved is not only relevant to understanding visual processing but the function of neocortex in
Neurons in primary visual cortex of cat exhibit striking selectivity for stimulus orientation 1, responding vigorously to contours of the preferred orientations and weakly, if at all, to stimuli Neurons in the primary visual cortex (V1) respond preferentially to stimuli with distinct orientations and spatial frequencies. Although the organization of orientation selectivity has been thoroughly described, the arrangement of spatial frequency (SF) preference in V1 is controversial. Several layouts have been suggested, including laminar, columnar, clustered, pinwheel, and binary
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The three most significant factors linked to the survival, and death of cat retinal ganglion cells following lesions of primary visual cortex are maturational status, patterns of connectivity, and rate of degeneration of lateral geniculate nucleus (LGN) neurons. β (X)-retinal ganglion cells in the cat and monkey, and by extension humans, have "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.
Key features include: comprehensive account of cat primary visual cortex; The number of thalamocortical synapses is small primarily because there are only ∼, relay neurons to supply the whole primary visual cortex in the cat (Peters and Payne, ).
Of course the question of the relative efficacy of the synapses Golgi and axonal transport techniques have been used to examine the organization of neurons within primary visual cortex, a of the cat.
This organization has been compared to that of the primate cortical area 17 as described in previous studies and it is discussed in relationship to the distribution of afferents from the dorsal lateral ISBN: OCLC Number: Description: xiii, pages, 1 unnumbered leaf of plates: illustrations ; 27 cm.
Contents: The visual cortex of the normal mouse and the reeler mutant / Alan L. Pearlman --The visual cortex of the rat / Alan Peters --Connections of visual cortical areas in the cat / Alan C. Rosenquist --Physiology of cat striate cortex / G.H.
1. J Comp Neurol. Dec 22;(4) Neurogenesis of the cat's primary visual cortex. Luskin MB, Shatz CJ. The 3H-thymidine method of birth-dating was used to determine when the cells belonging to each of the principal cellular layers of the cat's primary visual The Cat Primary Visual Cortex book are :// The human visual system can detect and discriminate between an incredibly diverse assortment of stimuli that may be chromatic or achromatic, in motion or not, patterned or unpatterned, two-dimensional or three.
Remarkably, the neural end-product of visual stimuli impacting upon the retina is, in one sense, always the same. After the complexities of The purpose of the present study was to address how rapidly changing luminance contrast is represented in the cat primary visual cortex. Using contrast stimuli presented randomly at 25 Hz without a blank interval between successive stimuli, we have shown that (1) the increment in contrast gain mediates the development of the contrast response The study was performed on neurons with direction selective (DS) receptive fields (RFs) in the primary visual cortex of the cat.
Preferred directions (PDs) of these cells to a single light spot and a system of two identical light spots moving across the RF with a given angle between them were compared. Directional interactions appeared when the angles between the directions of the ?PaperID= Primary visual cortex Axons from the optic radiation synapse on layer IV neurons of the primary visual cortex (also known as area 17 cat, striate cortex or V1).
Cortex is anatomically structured in layers, numbered from I (superﬁcial) to VI (deep). The striate cortex Efficient. Snap. Crackle. Pop. Those are the sounds that Professors David Hubel and Torsten Wiesel heard in the early s when they recorded from neurons in the visual cortex of a cat, as they moved a bright line across its retina.
During their recordings, they noticed a few interesting things: (1) the neurons fired only when the line was in a particular place on the retina, (2) the activity of these The macaque primary visual cortex, like that of all mammals studied, resides in the posterior pole of the occipital cortex (Fig.
Figure 8. Visual input to the brain goes from eye to LGN and then to primary visual cortex, or area V1, which is located in the posterior of the occipital lobe. Adapted from Polyak () Henry GH. Receptive field classes of cells in the striate cortex of the cat.
Brain Res. Sep 9; (1):1– Horton JC, Hubel DH. Regular patchy distribution of cytochrome oxidase staining in primary visual cortex of macaque monkey. Nature. Aug 20; ()– Systems neuroscience has produced an extensive body of evidence on the anatomy and function of mammalian visual cortex, but the transformation of this knowledge into a coherent understanding of cortical computation in early visual processing has been limited.
Computational modeling can integrate such fragmented data into models that satisfy the broad range of The laminar organization of SF dynamics is also unknown, knowledge of which may be useful for determining how SF tuning dynamics of cat area 17/18 neurons arise in cortical circuits.
To address these issues, we recorded the activities of multiple neurons in the cat area 17/18 using microelectrode arrays and characterized the time courses of the CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): We have investigated the relationship between membrane potential and firing rate in cat visual cortex and found that the spike threshold contributes substantially to the sharpness of orientation tuning.
The half-width at half-height of the tuning of the spike responses was 23 8°, compared with 38 15 ° ?doi= Our results show the presence of neurons tuned to absolute depth in the cat primary visual cortex. Looking at the shapes of the spike density curves obtained for the neurons with constant maximums (Figures 4B, 6, and 8A,B), one can see that this tuning is not sharp, and positions of maximums of these tuning curves are grouped in some The basic laminar organization of excitatory local circuitry in the primary visual cortex of the macaque monkey is similar to that described previously in the cat's visual cortex.
This circuitry is described here in the context of a two-level model that distinguishes between feedforward and feedback connections. Embedded within this basic framework is a more Contrast‐dependent OFF‐dominance in cat primary visual cortex facilitates discrimination of stimuli with natural contrast statistics.
Kefei Liu. Institute of Neuroscience and State Key Laboratory of Neuroscience, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, :// On- and off-center geniculate afferents form two major channels of visual processing that are thought to converge in the primary visual cortex.
However. 1. J Neurosci. Jul 8;35(27) doi: /JNEUROSCI Local Circuits for Contrast Normalization and Adaptation Investigated with Two-Photon Imaging in Cat Primary Visual ://A large-scale computational model of the thalamocortical system containing specific thalamic structures and four layers of cat primary visual cortex (V1) has been developed and simulated in the parallel NEURON environment.
The model represents aAn optical‐resolution PAM (OR‐PAM) system is set up and the acquired images of cat primary visual cortex are used to demonstrate the effectiveness of the proposed algorithm.
The proposed algorithm successfully extracts a complete and complex arteriole tree