animal experiment nonhuman 174 controlled study 156 article 136 male 130 Animals 120 priority journal 110 Male 98 learning 94 Memory 76 crab 64 long term memory 64 memory consolidation 64 memory 56 Learning 52 rat 50 Brachyura 46 animal tissue 46 hippocampus 44 Hippocampus 42 Rats 40 conditioning 40 training 40 animal behavior 38 Avoidance Learning 36 animal 36 Article 34 Behavior, Animal 34 physiology 34 Rats, Wistar 32