P300 response to tones and speech sounds after cochlear implant: A case report

P300 potentials evoked by tones and spoken words were recorded from a 20‐year‐old man with a House‐3M® single‐channel cochlear implant. Three months after cochlear implantation, there was a slight appearance of P300 response to both pure‐tone stimuli and spoken‐word stimuli; 6 months later, clearly identifiable P300 response to both pure‐tone stimuli and spoken‐word stimuli were obtained. These results are consistent with an encoding improvement for re‐establishment of information processing after auditory rehabilitation.