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• W2090164562 abstract "EEG and skin potential responses to repeated auditory stimuli of two different intensities were studied. Two sets of instructions, to attend to and to ignore the sounds, were given. Ratings of EEG stages of sleep and also a quantitative measure of 4–7 c/sec activity were used to measure drowsiness. It was found that significantly more evoked skin potential changes occurred in the “attend to sound” periods than in the “ignore sound” periods, but this variable did not affect the rate of habituation. Transient EEG responses, viz. V waves and K complexes, did not habituate and their number was not affected by instructions to the subject, although significantly more occurred when the stimulus was loud. Changes in ongoing EEG activity during a stimulus also did not habituate, rather there was a tendency for these to increase in number during the experimental period. The nature of the instructions to the subject was a significant variable here, but the intensity of sound was not. In the case of all three types of response there was a significant correlation, positive or negative, between the number of responses recorded and the degree of drowsiness at that time, as assessed by the amount of 4–7 c/sec activity. There was also a significant association between the frequency with which responses were evoked and the stage of sleep obtaining at the time. The findings are discussed in relation to Sokolov's concept of the orienting reflex. Les réponses EEG et électro-dermales à des stimuli auditifs répétitifs de deux intensités différentes ont été étudiées. Deux consignes, de prêter attention aux sons et de les ignorer, ont été données. L'évaluation de la somnolence a été faite par des estimations des stades EEG de sommeil et par la mesure quantitative de l'activitéà 4–7 c/sec. Il a été trouvé un nombre significativement plus grand de modifications évoquées du potentiel cutané durant les périodes “d'attention aux sons” que pendant les périodes de “sons ignorés” mais cette variable n'a pas modifié la vitesse d'habituation. Les réponses EEG transitoires, ondes V et complexes K, n'ont pas montré d'habituation et le nombre de ces réponses n'a pas été modifié par les consignes données au sujet, bien que significativement plus grand lorsque le son était fort. Des modifications de l'activité de fond pendant la stimulation n'ont pas montré d'habituation, la tendance étant plutôt vers une augmentation du nombre de ces modifications pendant la période d'expérimentation. La nature des consignes données au sujet constituait une variable significative, mais non pas l'intensié du son. Dans tous les trois types de réponses il existait une corrélation significative, positive ou négative, entre le nombre des réponses enregistrées et le degré de somnolence à ce moment, estimé selon la quantité d'activité à 4–7 c/sec. Il existait également une association significative entre la fréquence avec laquelle les réponses ont été évoquées et le stade de sommeil à ce moment. Ces résultats sont discutés en relation avec le concept de Sokolov du réflexe d'orientation." @default.
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• W2090164562 date "1966-02-01" @default.
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• W2090164562 title "Evoked changes in EEG and electrodermal activity during the waking and sleeping states" @default.
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• W2090164562 doi "https://doi.org/10.1016/0013-4694(66)90155-6" @default.
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