Transcutaneous Vagus Nerve Stimulation in Aphasia After Stroke

"Transcutaneous auricular vagus nerve stimulation using the Nurosym (Parasym Ltd) device.~Stimulation parameters:~Pulse width: 250µs; Frequency: 25Hz; Intensity: Below pain threshold.~The active stimulation will be delivered to the left tragus. Participants will complete the intervention at home once they have received sufficient training on how to use the stimulation device."

Stimulation will be delivered at the same parameters however, sham stimulation will be delivered to the left earlobe. Earlobe stimulation has been used as a sham in other studies as it is not thought to activate the vagus nerve.

Computer-based Speech and Language Therapy will be completed whilst wearing the stimulation device in all groups. The Step by Step programme uses an errorless learning approach to practice naming. All participants will practice a set of 30 meaningful words during the intervention. Participants will complete the SLT programme at home on an ipad, whilst using the stimulation device.