A closed-versusopen-set measure of speech discrimination in normally hearing young and elderly adults

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Abstract
This investigation sought to determine whether the pattern of performance differed between young and elderly normally hearing adults on a closed v. open-set discrimination task. The California Consonant Test was administered at 32 dB SL (re: SRT) to 20 young and 20 elderly normally hearing subjects under two conditions: one which required subjects to mark their response on a multiple choice answer form; and a second which required subjects to provide a one-word written response on a blank answer form. The only significant difference occurred within the young group between conditions (closed-set, open-set). The young group's speech discrimination was significantly better in the closed-set condition then in the open-set condition. No other differences were significant. The results question the concept of phonemic regression as a concomitant of ageing.

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