While engaging in precise hand activities, many people, including the author, often unconsciously stick out their tongue. This seemingly odd behavior is linked to our brain’s deep evolutionary history, where hand and tongue movements are intertwined. Although these movements are controlled by different nerves, research shows that this coordination likely originated from our ancestors’ hand-to-mouth feeding and the evolution of spoken language, highlighting the brain’s intricate and holistic design.
  

Key Points: 

1. Many individuals subconsciously stick out their tongue during precision hand tasks, hinting at an evolutionary relationship between hand and tongue movements.
2. The tongue and hands are controlled by different neural pathways; the tongue by the cranial nerve and hands by spinal nerves. Any neural connection between them happens within the brain.
3. Hand and mouth coordination can enhance performance, evident in activities like martial arts where vocalization and movement are synchronized.
4. Research demonstrates that specific hand and tongue movements activate the same regions in the brain, suggesting a deep-seated neural relationship.
5. The coordination between hand and tongue movements is believed to have roots in our ancestors’ hand-to-mouth feeding actions and the evolution of spoken language, emphasizing the brain’s holistic functioning.

Source: https://www.quantamagazine.org/the-hidden-brain-connections-between-our-hands-and-tongues-20230828