If the electrical brain stimulation is successful at the clinical stage, it could then be offered by speech therapists. The stimulation is known as transcranial direct current stimulation (tDCS), and it increases the firing rate of neurons in certain regions of the brain. The trial itself involves 40 participants who have to speak in time with a metronome, saying one syllable per beat. Jennifer Chesters, a speech and language researcher at the University of Oxford who is involved in the trial. Half are given electrical stimulation for 20 minutes while the rest wear the electrodes without them being switched on as a control.

Source: Daily Mail January 26, 2019 15:22 UTC