“…Although no effort was made to systematically control for the rearing practices of each facility, each provides nursery-housed animals with environmental enrichment, conspecific age-mate social contact, and introduction into larger social groups following infancy. It is notable that differences in lateralisation in cerebral organisation, as reflected in the relative size of the corpus callosum to brain size or from direct measures of brain asymmetry, has also been reported in differentially reared rhesus (Sanchez, Hearn, Do, Rilling, & Herndon, 1998) and squirrel monkeys (Lyons, Afarian, Schatzberg, Saywer-Glover, & Moseley, 2002) but not in chimpanzees (Dunham & Hopkins, 2006;Hopkins, Dunham, Cantalupo, & Taglialatela, 2007). Thus, the differences in lateralisation seen between mother-and nursery-reared monkeys compared to chimpanzees appear to generalise to behavioural and brain measures.…”