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Single-formant dynamically changing harmonic vowel analogs, a target with a single frequency excursion and a longer distracter with a different fundamental frequency and repeated excursions were generated to assess informational and energetic masking of target transitions in young and elderly listeners. Results indicate the presence of informational masking that is significant only for formant excursions of sub-phonemic changes. Elderly listeners perform similarly to the young, with the exception that they require a target/distracter ratio about 10 to 20 dB larger.