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. Bouissou, Nous nous intéresserons plus précisément à l'un des principaux traits de celui-ci : l'émotivité, définie comme la prédisposition héritée du système nerveux autonome permettant de réagir de façon particulièrement forte et durable à certaines classes de stimuli (Archer 1973). La plupart des études sur la réactivité émotionnelle n'utilisent qu'un seul test, au cours duquel n'est enregistré qu'un nombre limité de comportements, RÉSUMÉS Comprendre le fonctionnement des groupes sociaux implique une connaissance des caractéristiques individuelles. Il existe plusieurs niveaux de réflexion dans l'étude des différences interindividuelles, le plus complexe correspondant à l'étude des dimensions du tempérament, 1987.