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Contribution à l'étude de la différenciation comportementale dans des groupes de rats soumis à une difficulté d'accès à la nourriture : influence des facteurs temporel et spatial ; mise au point d'un modèle simplifié

Abstract : In laboratory conditions, a behavioural differentiation appeared in a group of six rats subjected to an experimental design in which access to the feeder was made difficult for 3 hours each day. The apparatus was designed to oblige rats to dive and swim under water and to make it nearly impossible for them to eat the food at the feeder. The rats were obliged to carry the pellet back to the experimental cage. In these conditions, about half of them brought back food pellets to the cage (carriers, C) while the others (non-carriers, NC) stayed in the cage and obtained food only by stealing it. The same proportion of rats became NC when time of access to food was not limited. In this last condition, only one food pellet was usually in the cage at the same time whereas there were several pellets at once when access was limited to a 3-hour daily period. This way, it was difficult for the holder of the pellet, C or NC, to keep it and resist the attacks of others when access to the food was free. In another experiment, we allowed (for 3 hours each day) rats which dived to consume the food in a second cage away from the NC. Then, almost all rats became C. With groups of differentiated rats, we selected pairs (C / NC) in which social relations became specific and stable over time. This stability allowed us to determine to what extent a behavioural modification of one of the two rats had an influence on the other one and on the functioning of the pair. When the C did not carry food to the NC (the C was satisfied before the test), the NC did not dive, but it had important locomotive activity. It often came close to the C and frequently visited the tunnel. Left alone in the device, the NC significantly decreased its activity. This experiment on a pair opens up perspectives for a pharmaceutical investigation, through a treatment of the C, or the NC, or both rats, of the neurobiological mechanisms underlying the phenomenon of social differentiation.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2002_0249_GRASMUCK.pdf
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https://hal.univ-lorraine.fr/tel-01746734
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Submitted on : Thursday, March 29, 2018 - 10:43:42 AM
Last modification on : Wednesday, October 14, 2020 - 3:53:29 AM

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  • HAL Id : tel-01746734, version 1

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Valérie Grasmuck. Contribution à l'étude de la différenciation comportementale dans des groupes de rats soumis à une difficulté d'accès à la nourriture : influence des facteurs temporel et spatial ; mise au point d'un modèle simplifié. Autre. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10249⟩. ⟨tel-01746734⟩

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