environmental enrichment Article 4 nonhuman 4 Animals 2 animal 2 animal behavior 2 animal experiment 2 controlled study 2 experimental behavioral test 2 larva 2 Anhedonia 1 Antidepressive Agents 1 Caenorhabditis elegans 1 Cage change 1 Cage tilting 1 Cycle disturbance 1 Damp sawdust 1 Degree of contamination 1 Depression 1 Disease Models, Animal 1 Ecosystem 1 Enrichment factor 1 Freshwater sediment quality guidelines 1 Fruit 1 Gsx 1 ICP-MS 1 Linggi River 1 Malaysia 1 Malus 1 Mice 1