检索结果-内蒙古大学图书馆

Computation of color and brightness differences by rabbit visual cortex neurons

Neuroscience and Behavioral Physiology 2006年第3期36卷 235-245页

作者： Polyanskii, V.B. Evtikhin, D.V. Sokolov, E.N. Department of Higher Nervous Activity and Psychophysiology M. V. Lomonosov Moscow State University Moscow Russian Federation

Extracellular recording of the activity of 54 neurons in the rabbit visual cortex in responses to substitutions of eight colored and eight monochromatic stimuli in pairs was studied. Stimuli were uniform flashes of light displayed on an SVGA monitor and illuminated the whole retina. The responses of phasic neurons showed an initial discharge (50-90 msec from the moment of the change in stimulus), associated with the brightness or color difference between the stimuli. These "discrimination discharges" were used to construct an 8 × 8 matrix for each neuron, showing the mean number of spikes per sec in responses to changes in different pairs of stimuli. Processing of the matrix by factor analysis identified the major factors determining the axes of the sensory space. A brightness space with only two dimensions, with darkness and brightness orthogonal axes, was seen for 30% of neurons. A four-dimensional color space was seen in 22% of neurons, with two color and two achromatic axes. The sensory space of these neurons was similar to the spaces obtained by analyzing the early components of visual evoked potentials in rabbits induced by changes in color stimuli and behavioral operant responses in conditioned reflex color differentiation. The fundamental coincidence of the sensory spaces obtained by different methods identifies the general nature of the principle of vector coding and the existence of special neuronal mechanisms for detection of color and brightness differences in the visual field. © 2006 Springer Science+Business Media, Inc.

关键词： Four-dimensional color space Rabbit Two-dimensional achromatic space Vector coding visual cortex neurons

来源：评论

学校读者我要写书评

暂无评论

CYTOPLASMIC INCLUSIONS OF neurons IN MONKEY visual-cortex (AREA-19)

引用

ANATOMY AND EMBRYOLOGY 1975年第2期147卷 117-125页

作者： KOHNO, K CHANPALAY, V PALAY, SL HARVARD UNIV MED SCH DEPT ANAT & NEUROBIOL 25 SHATTUCK ST BOSTON MA 02115 USA

Several unusual neuronal inclusions were found in certain cells of the rhesus monkey visual cortex (Area 19): 1. Filamentous bodies, present in the small stellate cells of layer IV, globoid, 0.3–0.6 μm in diameter, consisting of fine 50 Å filaments in a hexagonal meshwork. These are often associated with the labyrinthine bodies. 2. Labyrinthine bodies found exclusively in the small stellate cells of layer IV, including certain neurons with dispersed ribosomes. These are 0.4–0.7 μm in diameter and consist of 900 Å wide tubes which interconnect with one another. The walls of these tubes are continuous and made up of a sheet or honeycomb lacework of small hexagonal 150Å subunits. 3. This inclusion, an aggregate 0.3–0.7 μm in size, consists of small membrane-bounded vesicles with a single dense granule associated with other non-membrane bound small dense droplets. The inclusions are always associated with the maturing face of the Golgi complex of certain layer IV pyramidal cells; as such, they may be an unusual product of the Golgi apparatus. These observations were confirmed by examination of stereo pairs of electron micrographs. Speculations are made with regard to possible functions for these inclusions.

关键词： visual cortex neurons Cytoplasmic inclusions

来源：评论

学校读者我要写书评

暂无评论

EFFECT OF BODY TILT ON RECEPTIVE-FIELD ORIENTATION OF SIMPLE visual CORTICAL-neurons IN UNANESTHETIZED CATS

引用

EXPERIMENTAL BRAIN RESEARCH 1981年第3-4期43卷 309-314页

作者： TOMKO, DL BARBARO, NM ALI, FN UNIV PITTSBURGH SCH MED DEPT PHARMACOL PITTSBURGH PA 15261 USA UNIV PITTSBURGH SCH MED DEPT PHYSIOL PITTSBURGH PA 15261 USA

In cats, the receptive field (RF) orientation of 53 simple visual cortical neurons was determined by recording the activity of single cells during presentation of stationary bars of light. An RF tuning curve was constructed for each cell by averaging the neural discharge resulting from the repeated presentation of a number of slit orientations. RF curves were then determined again, following a ***. roll tilt of the entire head and body, and subsequently after the return of the animal to the original horizontal position. RF tuning curves were typical of what others have found to characterize simple cells and were highly replicable on the return to the starting position. In 73% of the cells studied, the RF orientation after tilt remained unaltered relative to the head axis (.+-. ***.);in the remaining 27% of the cells RF orientations either under- or over-shot the retinal tilt by > ***. and in some cases by as much as ***.. These results support the hypothesis that the well documented vestibular inputs to visual cortex play a role in modifying the RF orientation selectivity of visual cortical neurons and suggest that such information may be an important neurophysiological substrate underlying visual spatial constancy mechanisms.

关键词： visual cortex neurons Head tilt Cats

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：