Abstract
The model presented is basically a servo-regulator containing an input-controlled sampling device and is intended for use as a tool in research on the control of water-intake in rats; a problem in the field of animal motivation. The model incorporates monitoring of the size of the main (extra-cellular and intra-cellular) body-fluid compartments, and proposes that these compartment volumes are the two relevant variables used to regulate the amount of water drunk. It is further argued that sodium chloride intake is controlled using information from the same receptor system. The sampling mechanism of the model accounts for competition among different motivations. Explanations of the interacting relationship between eating and drinking, and between water-intake control and renal control are also included.
Sommaire
Le modèle présenté est essentiellement un servo-régulateur comportant un système d'échantillonnage contrôle par son entrée et est destiné à servir d'outil de recherche pour la mesure de l'eau absorbée chez les rats; c'est un problème du domaine de la motivation animale. Le modèle comprend la mesure de la dimension des principaux contenants des liquides du corps (volume extra-cellulaire ou intra-cellulaire) et se fonde sur le fait que ces volumes sont les facteurs principaux de la régulation de l'eau bue. Il est démontré plus loin que la régulation de l'absorption de chlorure de sodium s'effectue à partir des informations de même origine. Le mécanisme d'échantillonnage a été incorporé en modèle pour tenir compte de l'influence de différentes motivations. On trouvera également des explications relatives aux interférences entre le manger et le boire d'une part, et entre le contrôle de l'eau absorbée et l'activité rénale d'autre part.
Zusammenfassung
Das beschriebene Modell ist im Wesentlichen ein Servo-Regulator mit eingabekontrollierter Meßvorrichtung. Es wurde als Hilfsmittel zur Untersuchung der Regulation der Wasseraufnahme von Ratten entworfen. Das Modell überwacht die Größe der Hauptkompartimente des Körperwassers (extra- und intrazellulärer Raum). Es wird angenommen, daß die Volumina dieser Kompartimente die beiden wesentlichen Variablen in der Regulation der getrunkenen Wassermenge sind. Weiterhin wird die Auffassung vertreten, daß die Kochsalzaufnahme unter Benutzung der Information aus dem gleichen Rezeptorsystem reguliert wird. Aus dem Meßmechanismus des Modell ist der Wettbewerb zwischen verschiedenen Motivationen zu erklären. In dieser Arbeit werden Erklärungen über das Verhältnis des Essens zum Trinken und der Wasseraufnahmeregulation zur renalen Regulation gegeben.
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This work is part of the research programme of the National Physical Laboratory, and is published by permission of the Director.
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Oatley, K. A control model of the physiological basis of thirst. Med. & biol. Engng. 5, 225–237 (1967). https://doi.org/10.1007/BF02474532
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DOI: https://doi.org/10.1007/BF02474532