This study investigated whether brain activity could predict progress during stuttering treatment for 21 dextral adults who stutter (AWS). At the end of the initial treatment phase decreased activation within a single region, L. putamen was highly predictive of successful treatment progress.
Ingham, Roger J., Want, Yuedong, Ingham, Janis C., Bothe, Anne K., and Grafton, Scott T. (2013). Regional brain activity change predicts responsiveness to treatment for stuttering in adults. Brain and language http://dx.doi.org/10.1016/j.bandl.2013.10.007