Question: who claimed that behavior is affected by positive reinforcement
[{'answer': 'B.F. Skinner', 'provenance': [{'wikipedia_id': '211960', 'title': 'Reinforcement', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Introduction.\n'}]}, {'provenance': [{'wikipedia_id': '211960', 'title': 'Reinforcement', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 762, 'bleu_score': 0.5584207728692501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1129207015093481476}, 'section': 'Section::::Brief history.\n'}]}]