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From: Dave Corey
Date: 11 Oct 2009
Time: 14:44:42 -0500
Remote Name: 98.163.237.149
Yes, there have been some twin studies. In a relatively recent study, Felsenfeld et al. (2000) found that about 70% of the variability in stuttering risk was attributable to genetic factors. In this study monozygotic (identical) twins pairs were much more likely to be concordant for stuttering (i.e., both twins stutter) than were dizygotic (fraternal) twins. You might find the article interesting, so here is the reference: Felsenfeld, S., Kirk, K. M, Zhu, G., Statham, D. J., Neale, M. C., & Martin, N.G. (2000). A study of the genetic and environmental etiology of stuttering in a selected twin sample. Behavior Genetics, 30, 359-366.