Hand gestures are one channel through which people share meaning without words, and their style shifts with personality. Extroverted speakers tend toward bigger, more varied motions, while introverted speakers favor quieter, self-directed ones like touching their hair. Tracking these gesture patterns during a conversation reveals how much body movement carries — no words required.

People move their hands when they talk, but not all people move the same way. This project sorts subjects as shy or outgoing, then tracks their hand motions during a talk. Outgoing subjects used more varied gestures, while shy subjects showed more self-aimed movements like playing with hair.

Sorting people by how they act and feel reveals measurable differences in body language. When subjects classified as extroverted or introverted answer open-ended questions, the two groups produce distinct gesture patterns. Extroverted subjects use more varied and exaggerated gestures, while introverted subjects show more self-directed movements like playing with hair or resting hands on surfaces.

Whether someone gains energy from social interaction or from solitude can shape observable habits, including how they move their hands. A personality questionnaire sorts subjects into introverted or extroverted groups, and then open-ended interview questions reveal each group's gesture patterns. Comparing gesture variety between the two groups shows that the direction of a person's energy, outward toward people or inward toward the self, leaves a measurable physical signature.