Question: what is the primary purpose of the primary motor cortex homunculus
[{'answer': 'processing motor functions', 'provenance': [{'wikipedia_id': '3106301', 'title': 'Cortical homunculus', 'start_paragraph_id': 1, 'start_character': 162, 'end_paragraph_id': 1, 'end_character': 188, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3106301', 'title': 'Cortical homunculus', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 506, 'bleu_score': 0.8193013245317641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3272677306782041932}, 'section': 'Section::::Abstract.'}]}]