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• W2022246567 abstract "(1) Chez le chat curarise´, une injection de 0.5 mg/kg de re´serpine fait apparaiˆtre dans la formation re´ticule´e pontique (FRP), le corps genouille´late´ral et le cortex occipital, une activite´EEG de pointes de 100–300 μV et d'une dure´e de 40–100 msec (pointes PGO-R). Au niveau de la FRP cette activite´est enregistre´e dans les re´gions tegmentale et dorsolate´rale, ainsi que dans le groupe poste´rieur des n. du raphe´. (2) L'activite´spontane´e de 81 neurones parmi les 108 enregistre´s dans ces re´gions par micro-e´lectrodes est modifie´e en pre´sence d'une pointe: la fre´quence de de´charge est augmente´e dans 82% (n = 66) des cas, diminue´e dans 18% (n = 15). (3) L'augmentation de la de´charge peuteˆtre soit transitoire, pendant 20–60 msce, synchrone le plus souvent de la phase ‘ascendante’ de la pointe (Groupe I, n = 32, 39.5%), soit prolonge´e, jusqu'a`500 mseca`partir dur de´but de la pointe (Groupe II, n = 27, 33.5%). Pour les 7 autres neurones (9%), la courbe de probabilite´de de´charge en fonction des pointes re´alise un histogramme ‘multimodal’ (Groupe III). (4) La diminution de la de´charge est synchrone du de´but de la pointe, dure 20–40 msec et peuteˆtre suivie d'une bre`ve augmentation de la fre´quence (Groupe IV). (5) Lorsque les pointes PGO-R deviennent re´p'etitives, la modulation de la de´charge de´pend de l'activite´spontane´e du neurone: les cellulesa`activite´importante pre´sentent une diminution rythmique de leur de´charge — cellesa`activite´spontane´e faible ou nulle, une augmentation rythmique. (6) Dans la FRP dorsolate´rale, les neurones du Groupe I pre´dominent, alors que les neurones du Groupe II pre´dominent dans le tegmentum pontique et le raphe´; ceux du Groupe IV sont localise´s presque exclusivement dans le tegmentum. (7) Il est conclu que les pointes PGO-R correspondenta`la de´polarisation brutale et massive des neurones re´ticulaires. Les relations entre les pointes PGO-R et l'activite´PGO du sommeil paradoxal sont discute´es. (1) A single injection of reserpine (0.5 mg/kg) in curarized cats triggers sharp waves (100–300 μV in amplitude, 40–100 msec in duration) in the pontine reticular formation (PRF), the lateral geniculate body, and the occipital cortex (ponto-geniculo-occipital, PGO waves). At the level of PRF this activity is recorded in the tegmental and dorsolateral regions, and in the posterior group of the raphe nuclei. (2) The spontaneous discharge of 81 neurons of 108 recorded by microelectrodes in these regions, is modified during isolated PGO waves: the rate of firing is increased in 82% (n = 66) and decreased in 18% (n = 15). (3) The increase in discharge rate can be either transitory, during 20–60 msec, which usually corresponds to the ‘ascending’ part of the wave (Group I, n = 32, 39.5%), or prolonged up to 500 msec from the beginning of the wave (Group II, n = 27, 33.5%). In 7 other neurons (9%), the probability of discharge following the PGO waves is represented by a multimodal histogram (Group III). (4) The decrease in discharge rate is synchronous with the beginning of the wave, lasts 20–40 msec and may be followed by a short increase of firing (Group IV). (5) During repetitive PGO waves the discharge is modulated depending upon the spontaneous activity of the neuron: neurons with a tonic activity show a rhythmical decrease of their discharge; those with little or no spontaneous activity show a rhythmical increase. (6) Group I type neurons are most frequently found in the dorsolateral PRF; Group II in tegmental PRF and raphe nuclei; Group IV almost exclusively in tegmental PRF. (7) It is concluded that PGO waves correspond to an abrupt and massive depolarization of reticular neurons. The relationship between PGO waves of reserpine and PGO activity recorded during paradoxical sleep is discussed." @default.
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• W2022246567 title "De´charge unitaire de la formation re´ticule´e pontique et activite´phasique ponto-ge´niculo-occipitale chez le chat sous re´serpine" @default.
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• W2022246567 doi "https://doi.org/10.1016/0006-8993(69)90059-6" @default.
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