Latencies and correlation in single units and visual evoked potentials in the cat striate cortex following monocular and binocular stimulations

1972 ◽  
Vol 14 (4) ◽  
Author(s):  
B. Minke ◽  
E. Auerbach
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Striate Cortex ◽  
Single Units ◽  
Cat Striate Cortex ◽  
Visual Evoked

Colour and brightness coding in the central nervous system: theoretical aspects and visual evoked potentials to homogeneous red and green stimuli

1986 ◽  
Vol 227 (1246) ◽  
pp. 53-66 ◽  
Keyword(s):  
Central Nervous System ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Colour Vision ◽  
Striate Cortex ◽  
Colour Change ◽  
Cortical Cells ◽  
The Central Nervous System ◽  
X Cells ◽  
Visual Evoked

We designed visual evoked potentials experiments to study the differential aspects of colour and brightness coding in man. The substitution of equally bright red and green stimuli for a background yellow was investigated and compared with different luminance increments and decrements of red and green. A dominant N87 component was found for a colour change from yellow to brighter red colours, which was less pronounced for green and absent for yellow luminance changes. It is also absent for pure red luminance increments and green luminance changes, but reappears with red luminance decrements or red-offset. The data are discussed within the framework of a new concept of how the visual system fuses red-green information and black-white border information. Retinal X-cells can transmit colour and high spatial fre­quency achromatic information simultaneously by encoding only the presence of edges (a. c.) for the black-white stimuli and the presence of both edges (a. c.) and uniform areas of colour (d. c.) for red-green stimuli. Phylogenetically this kind of information transmission enables colour vision to be implemented in a retina such as the cat’s by adding only a second class of cones. Barlow’s economy principle will be violated for colour in the periphery, but restored early in the striate cortex where there is an early decoding of the combined chromatic and achromatic information by the concentric double opponent cells. The N87 behaviour correlates with the proposed discharge of peripheral X-type cells, but not with the discharge of cortical double opponent concentric or simple cells, which no longer respond to homogeneous colour stimuli. It is suggested that N87 may be generated by geniculate afferents in the dendritic arborization of cortical cells, reflecting the behaviour of peripheral units, and thus the violation of the economy principle, rather than the next step in cortical processing. The early cortical restoration of the economy principle is supported by the absence of any further dissociated behaviour for colour and brightness in later components.

Effects of Cooling “Association Cortex” on Visual Evoked Potentials

1967 ◽  
Vol 20 (2) ◽  
pp. 377-378 ◽  
Author(s):  
Arthur A. Uyeda ◽  
Joaquin M. Fuster
Keyword(s):  
Evoked Potentials ◽  
Frontal Cortex ◽  
Visual Evoked Potentials ◽  
Striate Cortex ◽  
Evoked Response ◽  
Association Cortex ◽  
Long Latency ◽  
Cortical Association Areas ◽  
Visual Evoked

Cryogenic probes were implanted in monkeys for cooling cortical “association areas” in unanesthetized state. Cooling was obtained by attaching special D.C. operated thermodes to the probes. When the parastriate and the lateral frontal cortex were cooled to 5° C, the amplitude of averaged visual evoked potentials recorded from the striate cortex was depressed. The change is conspicuous in long latency components of evoked response.

Relationship of Visual-Evoked Potentials With Specific Symptoms of Schizotypy

2012 ◽  
Author(s):  
Jeffrey S. Bedwell ◽  
Yuri Rassovsky ◽  
Pamela Butler ◽  
Andrea Ranieri ◽  
Christopher Spencer ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Relationship Of ◽  
Specific Symptoms ◽  
Visual Evoked

Nonlinear Analysis of Visual Evoked Potentials Elicited by Color Stimulation

1997 ◽  
Vol 36 (04/05) ◽  
pp. 315-318 ◽  
Author(s):  
K. Momose ◽  
K. Komiya ◽  
A. Uchiyama
Keyword(s):  
Visual System ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Normal Subjects ◽  
Second Order ◽  
First Order ◽  
The Relationship ◽  
Perceived Color ◽  
Second Order Nonlinearity ◽  
Visual Evoked

Abstract:The relationship between chromatically modulated stimuli and visual evoked potentials (VEPs) was considered. VEPs of normal subjects elicited by chromatically modulated stimuli were measured under several color adaptations, and their binary kernels were estimated. Up to the second-order, binary kernels obtained from VEPs were so characteristic that the VEP-chromatic modulation system showed second-order nonlinearity. First-order binary kernels depended on the color of the stimulus and adaptation, whereas second-order kernels showed almost no difference. This result indicates that the waveforms of first-order binary kernels reflect perceived color (hue). This supports the suggestion that kernels of VEPs include color responses, and could be used as a probe with which to examine the color visual system.

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