Manosevitz, M., Campenot, R. B., Swencionis, C. F. 1968. Effects of enriched environment upon hoarding. Journal of Comparative and Physiological Psychology 66, 319-324.
95 mice from 2 inbred strains were exposed to a postweaning enriched environment or to a standard environment. The design allowed assessment of effects due to environment, genotype, and genotype * environment interactions. Environment enrichment differentially affected hoarding performance in strains. The results also showed that the strains differed in hoarding and hoarding increased on successive trials.