Photically evoked potentials in the visual cortex of rabbits in relation to various electroencephalographic stages

Mimura, Keiichi; Satô, Kensuke; Kitajima, Haruo; Ochi, Nobuya; Ishino, Toru

doi:10.1016/0006-8993(67)90039-x

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…The configuration of the cortical response to a flash light varies depending upon the species of experimental animals (KUHNT, 1967;JACOBSON et al, 1968), the anesthetized state (SUZUKI et al, 1967;HEISS et al, 1969), EEG stages (EBE and MIKAMI, 1962;HUGHES, 1964;MIMURA et al, 1967;SIERRA, 1968;BEGLEITER et al, 1969;MIMURA, 1971), the recording site (MIMURA and SATO, 1970) and the parameters of stimulus light such as the intensity (TAGAWA, 1966;KOPELL et al, 1969), the duration (STERIADE and IONESCU, 1967), the stimulus interval (NAGATA, 1971), the stimulus patterns (SPINELLI, 1967;HARTER and WHITE, 1970), and the wave length (SHIPLEY et al, 1968;CIGANEK and INGVER, 1969;MASSOPUST et al, 1969). Therefore, in the next five paragraphs, we will discuss the photically evoked cortical responses obtained only in the cat, for the purpose of comparison with the L-waves in our LAR and the several components of the visually evoked response (VER) recorded in dark adaptation.…”

Section: Discussionmentioning

confidence: 99%

Visually Evoked Cortical Response in Light-Adapted Cat and Liminal Brightness Discrimination

1972

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Section: Discussionmentioning

confidence: 99%

Visually Evoked Cortical Response in Light-Adapted Cat and Liminal Brightness Discrimination

1972

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“…However, the evoked potential of cat and monkey by brief flash stimulus has a very complicated form in the unanesthetized state as recently demonstrated (HIROTA, 1964;HUGHES, 1964;STEINBERG, 1965). Further, the response in rabbits also has a complicated form such as in cat and monkey (IWASE et al, 1965;MIMURA et al, 1967a). Therefore, the B potential may not be the response of the same nature as the "secondary discharge" of FORBES and MORISON.…”

Section: Discussionmentioning

confidence: 99%

Specific and Nonspecific Activities of the Visual System in Rabbits

et al. 1967

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Although it has been shown that the rises in cortical activities by 3 and 5/sec flash stimulations verified in the frequency response of the visual cortex of unanesthetized rabbits (MIMURA and SATO, 1965) can be correlated with the excitability changes of 5/sec (BIsHOP, 1933) or 4-5/sec (PEARLMAN, 1963) in the visual cortex of the rabbit, it was not ascertained whether these excitability changes originated from the cortex itself or from subcortical structures nor was it ascertained whether it was from the specific or the nonspecific system. The present study is an attempt to solve the above problems through observations on the pattern of response to repetitive flash stimulations in the specific and non-specific systems of the cortex and subcortical structures of anesthetized and unanesthetized rabbits. METHODTen anesthetized and eleven unanesthetized rabbits weighing about 3kg were used. The anesthetized experiments were carried out under an intraperitoneal administration of sodium pentobarbital at a rate of 15mg/kg/2 hrs. The animal was mounted on the Johnson type stereotaxic instrument. Intubation to the trachea under ether anesthesia was done in unanesthetized experiments and the animal was immobilized of ter opening the skull by intraperitoneal administration of Flaxedil throughout the experiment, which necessitated artificial respiration with oxygen-mixed air.Stainless steel electrodes of 0.5mm and/or 80u diameter, insulated except at the tip, were inserted stereotaxically into the brain according to the atlases of SAWYER et al. (1954), GANGLOFF (1961) andFIFKOVA and MURsALA (1962). Surface records from the cortex were taken with 0.5mm diameter silver ball tipped electrodes. ERGs were recorded by placing the same silver ball electrode on the cornea. All recordings were monopolarly taken in relation to a reference electrode on the neck muscle. The location of the electrodes were checked histologically by the KLUVER-BARRERA staining techniques (1953) of ter each experiment.The exposed cortical surface was covered with warm mineral oil. The temperature

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“…(MimuRA et al 1967a). Therefore, this graph shows the changes in relative amplitude of the spontaneous regular wave over the time course of the "conditioning" evoked potential.…”

Section: Methodsmentioning

confidence: 98%

“…On the other hand, a slow surface-negative component preceded by a sharp, primary positive one is elicited by photic flash stimulation in rabbit's cortex (MIMURA et al 1967a). The duration of this component is not only similar to the spontaneous regular wave, but also the wave forms of the evoked potential whether driven actually or summed artificially at 4-6/sec and, which was mainly composed of the slow negativity component, are greatly similar with that of the spontaneous regular wave (MIMURA et al 1968).…”

Section: Introductionmentioning

confidence: 99%