title: Effects of environmental complexity and locomotor activity on brain weight in the rat.
mesh_terms: D000818:Animals; D001921:Brain / Q000033:anatomy & histology*; D003213:Conditioning, Psychological; D004777:Environment; D005106:Exploratory Behavior; D006234:Handling, Psychological; D006799:Housing, Animal; D008124:Locomotion; D008297:Male; D009043:Motor Activity; D009929:Organ Size; D005082:Physical Exertion; D011340:Problem Solving; D051381:Rats; D012201:Reward; D012934:Social Isolation