According to Mehrabian's research, the body language of the speaker has the greatest impact on communication.
Professor Mehrabian holds that nonverbal behavior (such as facial expressions, for example), tone of voice, and the literal meaning of the uttered phrase are the three fundamental components of effective face-to-face communication of emotions or attitudes. Mehrabian contends that these three crucial components explain how we express our liking or disliking of another person. His emphasis is on the significance of these nonverbal "clues" when they appear to be in conflict with the spoken words and/or tone. In the 1960s, Mehrabian created his initial theories on this subject. He developed the 7-38-55% communication rule based on the results of two studies he conducted in 1967.
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