It's the same study being described, both in the page I linked and the page linked by the other user. I linked directly to the published scientific article in which the researchers reported their study, including its methods and findings. Their work was published in the Journal of Fluency Disorders, which is how scientists share their research with each other. Before a study gets published in a scientific journal, a panel of reviewers (who also have scientific credentials, making them professional peers of the researchers who submit their work) examine the submission to make sure it doesn't appear to be junk science or a badly designed experiment. I suppose I should have said "Here's a direct link to the research." The previous link was to a news article about the same study. I hadn't heard of the study before, and I also hadn't heard of "News Medical," so I was kind of skeptical about the reporting without seeing the research results. From what I can tell, the news article is accurately summarizing the same information as the research paper in a less technical format, so I think it's truthful reporting. You're right that deep brain stimulation is fairly invasive, since a device has to reach deep layers of the brain to apply a tiny electrical current. This is a preliminary trial on one patient, so more testing is necessary to see if other people experience the same results. The patient in this trial didn't have any significant side effects, so that's very positive. But scientists are always caution when the sample size is 1. Maybe nine out of ten people would have negative side effects, and this study just coincidentally found that one out of ten who avoided any downsides. You're also correct that the DBS treatment reduced stuttering and increased quality of life, but these are all relative to his starting point which was quite debilitating at the beginning. The patient went from very severe stuttering and rating his QoL as severely impacted, to moderate stuttering and rating his QoL as mildly-moderately impacted. So, at the end of the day his stutter is still moderately severe and his QoL is still mildly to moderately impacted by dysfluency. And the researchers still note that his treatment should be combined with therapy to have the best results. So, this isn't a single magic solution but rather an promising line of research that could lead to an option among other options for people who stutter.