Why do I talk with my hands?Your brain connects your mouth and your gestures.

From the show

Science Around You

Ever wondered why your hands seem to have a mind of their own when you talk? It's not just a personal quirk. The parts of your brain that control speech and hand movement are deeply linked, an ancient connection that might go all the way back to fish. This wiring helps you access your thoughts and articulate them more clearly. For your listener, your gestures are a vital clue that helps them process what you're saying more easily. It turns out that talking with your hands is a fundamental part of communication.