Still, the foc.us is one of a few tDCS headsets designed for the consumer market and can, the inventor Michael Oxley claims, improve your working or short-term memory when the electrodes are placed on your prefrontal cortex.
One of the hardest tasks facing those who fit these devices is working out the precise choreography of the voltages and timings that need to be applied to the 20 or so electrodes embedded in the auditory nerve, in order to make them work properly.