Question: who was the first researcher to suggest that facial expressions are pre-verbal
[{'answer': 'Darwin', 'provenance': [{'wikipedia_id': '242760', 'title': 'Facial expression', 'start_paragraph_id': 30, 'start_character': 676, 'end_paragraph_id': 30, 'end_character': 682, 'bleu_score': 1.0, 'section': 'Section::::Universality hypothesis.\n'}]}, {'provenance': [{'wikipedia_id': '242760', 'title': 'Facial expression', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 896, 'bleu_score': 0.9576349285459751, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12987065016609624282}, 'section': 'Section::::Universality hypothesis.\n'}]}]