University of Michigan researchers recently released a study that shows how our rate of speech is a significant factor for convincing people to do things. People who spoke moderately fast, around 3.5 words per second, were much more successful at persuasion than people who talked very slow or very fast. The researchers looked at many factors — speech rates, fluency, and pitch –and analyzed which variables were important with successfully convincing people to participate in the survey. The findings are seem to confirm the obvious. People who talk really fast are viewed as not trustworthy and that people who talk really slow are very smart. PsychCentral