A method and system to help determine the extent to which a hearing prosthesis recipient is exposed to speech. The hearing prosthesis will log data regarding audio input, optimally in correspondence with times when the hearing prosthesis is in a stimulation-on mode in which the hearing prosthesis is set to stimulate a physiological system of the recipient in accordance with received audio input, so as to facilitate identification of speech to which the recipient is exposed. Further, as the hearing prosthesis itself receives the audio input, the hearing prosthesis may analyze the audio input to determine one or more linguistic characteristics of the audio input, such as a quantity of speech by the recipient and/or by others, and the hearing prosthesis may output data representing the determined one or more linguistic characteristics. Advantageously, the data may then be used to help facilitate rehabilitation of the recipient.
