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Mean correct identification of both vowels in the vowel pairs as a function of F0 difference for normal-hearing listeners. (A) Mean scores for five listeners. (B)–(F) Mean scores for individual listeners (NH1–NH5). Error bars denote ±1 SEM. F0 benefit (shown in each panel) is defined as the difference in identification scores between the 4- and 0-semitone F0 difference conditions.
