a. Subject S1. b. Subject S2. c. Subject S3. For each subject, the CNC percent correct scores are shown prior to starting the study (approximately -12 months), at the start of the study (initial visit or 0 months), and at the end of the study (2-5 months). Open symbols indicate scores with the clinical frequency allocation, filled symbols indicate scores with the experimental frequency allocation. Diamonds indicate CI+HA scores, squares indicate CI only scores, and triangles indicate HA-alone scores.