Those brain regions is related to both high fluid
intelligence and the production of gestures. When people
talk, they often gesture with
their hands. ... Our study shows that gesturing may be a function of and may even contribute to brain development.
Hand gestures can help you point to people and things in your surroundings (e.g. pointing at an object while you say “look at that”)
Hand gestures can help you add emphasis and structure when you talk (e.g.
showing numbers when you count, “1, 2, 3…”)
Hand gestures give clues about your emotional state.
