title: The Maudsley reactive and nonreactive strains of rats: a clarification.
abstract: The origin of the Maudsley reactive and nonreactive strains of rats and the construction of the survey of researches using them are briefly reviewed in the light of Archer's criticisms. The reasons for reasserting that they represent a valid dichotomy in emotionality are summarized.
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D001947:Breeding; D004644:Emotions; D005824:Genetics, Behavioral; D051381:Rats; D012641:Selection, Genetic; D013045:Species Specificity