The brain research into stuttering seems to have gone dead. Still no new articles... However, there is at least one article on genetics in the Journal of Fluency Disorders: Genetic studies of stuttering in a founder population . Unfortunately, there are no conclusive results. This might also explain why the authors published it in JFD instead of a higher-ranked genetics/science journal. A genetics insider pointed out to me that 1) this family looks a bit suspicious as their visual appearance shows anormal traits which could suggest other issues which in turn might influence the occurence of stuttering or stuttering-like symptoms, and 2) the family is highly inbred which creates all sorts of methodological issues that are tricky to deal with.