Investigating the SMA's Role in Speech and Reading Fluency in PWS With rTMS

The goal of this clinical trial is to study how a part of the brain called the supplementary motor area (SMA) is connected to speech and reading fluency in adults who stutter. Researchers will use a method called repetitive transcranial magnetic stimulation (rTMS) to learn more about this relationship. The main question it aims to answer is: -Will participants' speech and reading fluency improve when we stimulate the SMA with rTMS? Participants will take part in both placebo rTMS and real rTMS sessions. Participants will: * Come to the research center for 2 days, with at least a one-week break between visits * Read 4 passages and speak on 4 topics * Be video recorded while doing these tasks