Albert Mehrabian - the 7%/38%/55% Rule

Note that the following rule, per Mehrabian, applies to discerning whether one likes or dislikes a thing. Critics state that the rule cannot be expanded to public speaking and that the 7/38/55 numbers are imprecise.

The 7/38/55 Rule:

If there is any "incongruency" between words, vocal tone, or body language, the hearer gets more meaning from what they see than what they hear. 55% of meaning is derived visually, 38% from the vocal tone, and only 7% from the actual words.