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Orientation column

About: Orientation column is a research topic. Over the lifetime, 1142 publications have been published within this topic receiving 130169 citations.


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Journal Article
TL;DR: The analysis of the data obtained suggests a specificity of the influence of the background illumination level, intensity, area, duration and orientation of the stimulus on the dynamic reorganization of the receptive field.
Abstract: Influence of parameters of local light stimulation of different points of receptive fields on characteristics of previously observed dynamic reorganization of recorded receptive fields of visual cortex and lateral geniculate neurons in time microintervals was studied in details in computer-controlled acute experiments on unanesthetized immobilized cats. The dependence of this process on the background illumination level, on intensity, contrast, area, duration, energy and orientation of a local rectangular or round light stimulus flashing in a random order at 100 points of the tested part of the visual field was determined. The analysis of the data obtained suggests a specificity of the influence of the background illumination level, intensity, area, duration and orientation of the stimulus on the dynamic reorganization of the receptive field. All the parameters were revealed to have a significant nonmonotonic influence on the receptive field parameters. The found effect is discussed for its probable functional significance and a possibility of its participation in process of information coding in the visual system.

3 citations

Journal ArticleDOI
TL;DR: It is suggested that columns in field 17 of the cat cortex are associated with 6–8 hyperColumns, though only with a single type of neuron within these hypercolumns, in terms of eye dominance and orientational preference.
Abstract: The spatial distribution of horizontal internal connections in field 17 of the cat cortex was studied after microiontophoretic application of horseradish peroxidase to individual cortical columns. Cluster analysis of the distribution of labeled cells in the superficial layers in the tangential plane of the cortex was performed. Field 17 included 7 ± 1 clusters of up to five cells. Clusters were distributed into two layers, separated by 1.2 ± 0.3 mm. The distance between the centers of the clusters forming rows was 0.8 ± 0.3 mm. The spatial characteristics of the grouping of cells sending axons into the cortical column were compared with published data based on optical visualization of the activity of neurons in orientational and eye-dominant columns of the visual cortex. It is suggested that columns in field 17 are associated with 6–8 hypercolumns, though only with a single type of neuron within these hypercolumns, in terms of eye dominance and orientational preference.

3 citations

Proceedings ArticleDOI
27 Mar 1989
TL;DR: In this paper, the authors applied a set of one-and two-bar tests to directionally selective (DS) complex cells in the cat's striate cortex, and also to a motion energy model.
Abstract: The authors have applied a set of one- and two-bar tests to directionally selective (DS) complex cells in the cat's striate cortex, and also to a motion energy model. Both one- and two-bar responses of DS complex-cells match closely the unidirectional output of the motion energy model, which depends on a squaring operation. It thus appears that DS cortical neurons responding to a moving image calculate a signal very nearly equal to the unidirectional movement energy. The authors consider how the visual cortex could calculate the squaring operation needed for the energy model. >

3 citations

Journal Article
TL;DR: The variability of neuron orientation tuning in separate columns and the degree of it stability under changes in levels of the contrast between stimulus and background were studied in experiments on unanesthetized, relaxed cats.
Abstract: The variability of neuron orientation tuning in separate columns and the degree of it stability under changes in levels of the contrast between stimulus and background were studied in experiments on unanesthetized, relaxed cats. Several types of orientation columns were revealed: with a relatively high, standard and stable orientation tuning; with a widely changing orientation tuning from neuron to neuron; with invariance to contrast level; with variant orientation tuning; with mixed (invariant-variant) properties. In the columns, standard-nonstandard properties, on the one hand, and properties of invariability-variability, on the other hand, could combine in different ways. More often differences of orientation tuning within a column were observed between neurons of upper and lower cortical layers. Possible distinctions in the functional role of types of orientation tuning in columns described and in mechanisms of formation of detector properties of their neurons are discussed.

3 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231
20223
20212
20208
20192
20189