共查询到20条相似文献,搜索用时 15 毫秒
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I A Shimko 《Zhurnal vysshe? nervno? deiatelnosti imeni I P Pavlova》1984,34(1):124-128
The influence of long-term (3 months) locomotor deprivation of rats in a month age, on the evoked potentials (EP) of the sensorimotor and the visual cortex was studied in conditions of presentation of single and paired stimuli. Changes were revealed in both cortical zones. An increase of peak latency of the initial positive EP phase in the sensorimotor cortex, and prolongation of the process of changes in excitability of neural elements, elicited by conditioning stimulus, was revealed both in the sensorimotor and the visual areas. The effect of deprivation on the dynamics of changes in neuronal systems excitability was greater in the visual evoked responses. 相似文献
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Evoked potentials in the superior colliculus during monocular presentation of short flashes to the dark- and light-adapted eye were studied in experiments on cats anesthetized with pentobarbital. On insertion of the recording electrode deep into the superior colliculus simultaneous nonspecular inversion of the second and third components of the evoked potential was observed. The first component was not inverted. During stimulation of the retina by pairs of flashes the second response appeared when the interval between them was 70 msec. The amplitudes of the second and third components of the evoked potential decreased with an increase in the frequency of stimulation. Suggestions regarding the genesis of the various components of the evoked potential are put forward.Institute of the Brain, Academy of Medical Sciences of the USSR, Moscow. Translated from Neirofiziologiya, Vol. 5, No. 1, pp. 21–27, January–February, 1973. 相似文献
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The tonic influence of the superior colliculus (SC) on the formation of visual evoked responses of the sensomotor cortex (SMC) was demonstrated in experiments on conscious rabbits. The influence of SC on the function of SMC was found to be realized with the involvement of tectothalamocortical (through the nucleus lateral is posterior thalami — NLPT) connections. SMC of the conscious rabbit, in turn, exerts a phasic inhibitory influence on visual function of SC. The findings are discussed in the light of involvement of tectocortical and corticotectal inter-relations in the organization of visuomotor integration, which is essential for visually controlled behavior.A. I. Karaev Institute of Physiology, Azerbaidzhan Academy of Sciences, Baku. Translated from Neirofiziologiya, Vol. 24, No. 1, pp. 37–44, January–February, 1992. 相似文献
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O. V. Levchuk 《Neurophysiology》1969,1(1):57-62
We investigated evoked responses of the cerebellar cortex of rabbits under Nembutal or chloralose anesthesia to stimulation of the sciatic, brachial, and vagus nerves. The parameters of evoked potentials (E Ps), together with features of their distribution throughout the cerebellar cortex, enabled us to divide them provisionally into three types. Evoked potentials of the first type have a latent period of 5–10 msec and a two-phase or more complex shape. Evoked potentials of the second type have a latent period of 10–23 msec and include from one to four components. Evoked potentials of the third type are discharges with long latent periods (20–50 msec) and consist of a series of slow sinusoidal oscillations. Appearance of an initial electronegative component is characteristic of EPs of the cerebellar cortex of rabbits, especially those of the second and third types. Evoked potentials of the first type are local.N. I. Pirogov Vinnitsa Medical Institute. Translated from Neirofiziologiya, Vol. 1, No. 1, pp. 73–80, July–August, 1969. 相似文献
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Gregory T. Golden Thomas N. Ferraro Ruggero G. Fariello Theodore A. Hare 《Neurochemical research》1989,14(5):465-472
An ultransensitive triple-column ion-exchange/fluorometric method was utilized to measure the levels of over 30 amino acids and related primary amino compounds in Long-Evans rat superior colliculus (SC), visual cortex (VC) and inferior colliculus (IC). Comparison of levels of amino compounds revealed distinctly different profiles for each region. Major constituents were the neurotransmitters and related compounds glutamate, glutamine, GABA, taurine, aspartate and glycine. Glutathione levels were also relatively high in all three regions. SC exhibited a significantly higher level of GABA and -alanine compared to both VC and IC. VC had significantly higher levels of glutamate and taurine. VC exhibited the lowest level of glycine and IC the highest. A time-course experiment using SC documented that levels of eleven of thirty-four compounds, including GABA, were subject to significant postmortem alteration in vitro. SC GABA stability experiments indicated that significant in vitro increases of free GABA levels between 1 and 4 min postmortem were associated with equimolar decreases of conjugated GABA levels. 相似文献
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Gianluca Coppola Julien Crémers Pascale Gérard Francesco Pierelli Jean Schoenen 《BMC neurology》2011,11(1):91
Background
The mechanisms underlying the interictal habituation deficit of cortical visual evoked potentials (VEP) in migraine are not well understood. Abnormal long-term functional plasticity of the visual cortex may play a role and it can be assessed experimentally by light deprivation (LD). 相似文献15.
The neurons of lamina II, III, VII of the superior colliculus are interferometrically shown to develop features of cytochemical underdevelopment in response to the exclusion of specific visual impulsation. Of the neurons of the lamina studied, lower protein contents in their cytoplasm and nuclei are characteristic, in addition to smaller sizes in comparison with normal ones. A definite specificity of these changes is revealed, which is explained by morphofunctional peculiarities of the neurons of the lamina of the superior colliculus studied. 相似文献
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L. É. Kul'gavin 《Neurophysiology》1992,24(4):251-255
It is shown that in nembutal anesthetized cats, a single stimulation of motor cortex (MC) causes a response in lateral geniculate nucleus (LGN). The development of this response had a conditioning effect on the LGN response evoked by stimulation of the contralateral superior colliculus (SC), markedly inhibiting it. The degree of this inhibition depended on the time interval between the cortical conditioning stimulation and the tectal test stimulation. A single conditioning MC stimulation did not noticeably change the LGN responses evoked by a light stimulus, but markedly inhibited visual responses from deep SC layers (those regions which on stimulation gave rise to LGN responses). From the results, it is suggested that the MC monitors the execution of tectal influences on LGN function at the tectal level rather than the geniculate level, and it is precisely by this means that it regulates saccadic suppression of LGN function, in the realization of which, as presumed earlier, the SC takes part.A. I. Karaev Institute of Physiology, Azerbaijan Academy of Sciences, Baku. Translated from Neirofiziologiya, Vol. 24, No. 4, July–August 1992. 相似文献