Outcome variables The outcome variable is the voltage measured at each instant of time available for the hardware chipset cochlear implant used in this case the chipset cic4 that supports up to 14 measurements voltage pulse stimulation administered. Sequences stimulation and proposed measurements, MP1 + 2, CG, 3P and 4P (see below) which allows for a total of 14 measurements per isodifásico stimulus presented in different combinations of electrodes are used, which with the 22 electrodes and four proposed sequences a total of 2324 measurements per voltage measurement performed by the patient. This will take about 7 minutes to patient. Two of these measurements per day, approximately every 12 hours (morning and evening) will be made.