Investigating Non-invasive Brain Stimulation to Enhance Fluency in People Who Stutter

Inclusion Criteria: * Participant is willing and able to give informed consent for participation in the study. * Diagnosed with developmental stuttering of mild-moderate or greater severity * Native speaker of English * Normal or corrected-to-normal vision * Normal hearing Exclusion Criteria: * Speech, language or communication disorder other than developmental stuttering. * Contraindication to brain stimulation (tDCS or TMS) * Contraindication to MRI * History of drug abuse * History of a neurological or psychiatric illness * Any previous neurosurgical procedures * Taking prescription or over-the-counter medication that may affect brain function (for example, anti-depressants) * Family history of epilepsy (first degree relative) * Severe claustrophobia (as they may be unable to tolerate scanner)