Dr. Barry Guitar, of the University of Vermont, is familiar with the isolating effects of stuttering. As a recognized expert in research and treatment of this condition, he has worked with people from ...

Karen Hopkin: This is Scientific American’s 60-Second Science. I’m Karen Hopkin. Hopkin: When you stop to think about it, it’s not all that easy to speak. First you have to think of something to say.

The medical condition, “disfluent speech” or “dysfluent speech” is commonly referred to as “stuttering” in American English. In British English, the condition is called “stammering.” The terms ...