House, Dalton Pigeons can learn a difficult discrimination if reinforcement is delayed following choice. [electronic resource] - Animal cognition May 2020 - 503-508 p. digital Publication Type: Journal Article ISSN: 1435-9456 Standard No.: 10.1007/s10071-020-01352-9 doi Subjects--Topical Terms: AnimalsChoice BehaviorColumbidaeImpulsive BehaviorReinforcement ScheduleReinforcement, Psychology