1. Department of Communication Sciences and Disorders, University of South Carolina , Columbia, SC 29208 , USA
2. Department of Cognitive Sciences, University of California , Irvine, CA 92697 , USA
3. Department of Language Science, University of California , Irvine, CA 92697 , USA
4. Department of Neurology, Johns Hopkins University School of Medicine , Baltimore, MD 21218 , USA
5. Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine , Baltimore, MD 21218 , USA
6. Department of Cognitive Science, Johns Hopkins University , Baltimore, MD 21218 , USA
7. Department of Neurology, Emory University School of Medicine , Atlanta, GA 30322 , USA