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• W2056642256 abstract "1. The effects of X-irradiation on cortical structure and on the electrical activity of the brain of rats treated at selected stages of foetal and early post-natal development have been studied. 2. Structural changes resulting from this treatment ranged from major disorganisation in rats irradiated on the 17th day following conception to absence of any apparent abnormality in animals irradiated on the 29th day. The development of the corpus callosum was impaired in all pre-natally irradiated groups. 3. These abnormalities were associated with changes in electro-cortical activity which, although related to the severity of the structural disorganisation, were, on the whole, less significant than might have been expected. 4. The EEG and ECoG of pre-natally irradiated rats were of smaller amplitude than those of the normal animal and exhibited an anbormal amount of fast “spiky” activity, which occurred in bursts. 5. The recruiting response of treated animals maintained a shape which was characteristic of the normal response. The potentials evoked in the earliest irradiated group were of small amplitude while in all the prenatally irradiated groups the duration of the negative wave was reduced. In all other treated animals, however, both spatial and temporal components of the response were normal. 6. It is suggested that, in the main, these findings support the view that thalamo-cortical integration is necessary for the manifestation of certain aspects of the spontaneous activity of the brain. They draw further attention to the extent to which spontaneous and evoked activity depend upon events occurring within the thalamus. Some implications of disturbance of this relationship are discussed. 1. Les auteurs étudient les effets des rayons X sur la structure histologique et l'activité électrique du cortex cérébral de rats irradiés à des moments choisis de leur évolution foetale ou post-natale. 2. Les modifications histologiques varient depuis la désorganisation complète du cortex chez les rats irradiés le 17e jour suivant la conception, jusqu'à l'intégrité apparent chez ceux irradiés le 29e jour. Le développement du corps calleux est empêché chez tous les rats irradiés a vant la naissance. 3. Ces anomalies sont associées à des modifications de l'activité électrique corticale qui, quoique proportionnelle à la gravité de la désorganization structurale, est moins importante qu'on n'aurait pû le supposer. 4. L'EEG et l'ECoG des rats irradiés avant la naissance sont moins amples que ceux de l'animal normal et présentent une proportion inhabituelle d'activités “pointues” qui surviennent en bouffées. 5. La réponse recrutante revêt chez les animaux irradiés des aspects identiques à ceux qui caractérisent la réponse normale. Les potentiels évoqués par contre sont moins amples chez les animaux irradiés très lôt pendant la vie foetale, la durée de leur onde négative est moindre chez tous ceux irradiés avant la naissance, tandis que toutes les composantes spatiales et temporelles sont normales chez les animaux traités ultérieurement. 6. Les auteurs considèrent que, dans leur ensemble, pareilles données plaident en faveur du rôle jouépar l'intégration thalamo-corticale dans l'élaboration de certains aspects de l'activité électrique spontanée du cerveau. Ils attirent l'attention sur le fait que l'activité életrique cortical spontanée et provoquée dépendent d'événement survenant dans le thalamus. Ils discutent enfin quelques faits résultant d'une perturbation de ces relations thalamo-corticale." @default.
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• W2056642256 title "Electrocortical activity in the rat x-irradiated during early development" @default.
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