魚類の網膜活動電位竝びに視覚中枢誘発電位との関連性
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概要
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The electroretinogram (ERG) of Carassius auratus in light-adapted state shows typical response of the "I type retina" which exhibits the large a- and d-waves. The response of light-adapted eye, in addition, is characterized, by the appearance of the second cornea negative component which seemed to relate to the depression of the b-wave, and with a series of ripples superposed on the slow potential changes as its more prominent feature. These oscillatory ripples seemed to represent the synchronized response of the ganglion cell axons in retina in view of both the present result and the findings by Fry et al. ('34). The various types of the off-effect (d-wave) illustrated in Fig. 4, C-F were occasionally recorded. The response from a dark-adapted eye markedly differs from that of light-adapted eye with respect to appearance of the b-wave and lack of the off-effect and is characterized by the feature that the wave 5 is selectively pronounced. As shown in Fig. 8, D, the deflection of the wave 5 would appear to be added as a component separate from the slow potential changes of ERG. This clearly fortified the above-mentioned fact that the oscillatory ripples arise from other process in the retina. The response obtained from a well dark-adapted retina to low intensity flash show a large positive potential change, following a small negative wave, with variable latency longer than that of the b-wave. Comparing the responses of retina with that of visual center previousely reported ('57 a, b), the following interesting correspondencies between them are found: the number and the time intervals of the ripples superposed on both responses are almost equal in the case of light-adapted state. The ripples corresponded to the wave 5 in both responses are selectively pronounced by dark adaptation. The b-wave of ERG can hardly be detected from the light-adapted eye, and the second surface negative deflec-tion appears in the visual center response of light-adapted fish. On the contrary, in the dark-adapted state in which scotopic activity may be prominent, the second surface negative component in the visual center response in not observed, and the b-wave is clearly visible in the ERG. These facts lead me to think of the possible correlation between the initiation of the second surface negative component in the visual center response and the depression of the b-wave of ERG.
- 社団法人日本動物学会の論文
- 1958-03-15
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関連論文
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- 魚類の網膜活動電位竝びに視覚中枢誘発電位との関連性
- 魚類視覚中樞の誘発電位, 特に暗順応時に於ける誘発電位
- 魚類視覚中樞の誘発電位, 特に明順応時に於ける誘発電位の局所的差異竝びに薬物の作用