Article 1 T-maze test 1 adult 1 anergia animal experiment 1 animal model 1 appetitive behavior 1 aversive behavior 1 climbing 1 controlled study 1 depression 1 dopamine 1 drug effect 1 drug efficacy 1 effort 1 escape behavior 1 fluoxetine 1 food reinforcement 1 forced swim test 1 male 1 mental disease 1 motivation 1 mouse 1 nonhuman 1 serotonin 1 sucrose preference test 1 swimming 1 vigor 1