Investigation of Anatomical Correlates of Speech Discrimination

Subjects with hfPTAs ranging from 0-55 dB HL will be recruitedwith 100 persons self-reporting difficulty HIN (\> 50% of the time), and 100 persons reporting little difficulty HIN (\< 50% of the time) will be randomly assigned to one of five groups (n = 200) based on enabled HA features using an online random assignment tool. Unaided HIQ and HIN assessments will be conducted in the sound field, and baseline DPOAE and CAP assessments will be measured. Subjects will be fit with binaural premium level receiver-in-the canal HAs (Phonak B90 or equivalent model at the start of the study) with 56 dB SPL gain receivers, using closed domes, and programmed to NAL-NL2 target gain, and randomly assigned to the groups.