Determinants of emotionality in the rat: II. Strain differences.

Abstract

A standardized form of Hall's open-field test of emotionality was administered to 199 rats from 5 pure-bred strains. Defecation scores indicate 2 main groupings. Ambulation scores display interstrain differences which do not parallel those for defecation, except that the phenotypically identical black-hooded strains I and II are significantly differentiated, presumably because of a different genotype. The implications of the findings are discussed. (PsycINFO Database Record (c) 2006 APA, all rights reserved)