puits (1) formation (1) espèce (1) recherche (1) extraction (1) expérience scientifique (1) Language (1) Rules (1) Rules (1) Training (1) Water (1) Variations (1) Triplets (1) Species (1) Rodents (1) Research (1) Rats (1) Pitch (1) Heart (1) Functions (1) Example (1) Discrimination (1) Animals (1) Research (1) Relations (1) Training (1)