Inclusion Criteria:  Age > 18 years of age Patients with a Unilateral Cochlear Implant device in use for a minimum of 1 year Sentence recognition scores (AzBio) below 65% in the implanted ear for > one year following cochlear implantation. Ability to access internet to conduct computer-based auditory trainings and weekly video visits with study team weeks 2-5  Exclusion Criteria:  Non-English speaking Diagnosis (documented or self-reported) of a psychiatric or neurologic condition, or any other comorbidities that may interfere with the study or increase the level of risk (such as dementia, seizures, legal blindness, brain tumor) Implants, other than CI, above collar bone level that may interact with delivery of tDCS Inability to or unwillingness to use electronic devices/computers, participate in video visits, or make required visits