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Mean backward digit span performance for the native Mandarin speakers as a function of training day. Training days 3, 4, 7, and 8 were presented in speech-shaped noise, and days 5, 6, 9, and 10 were presented in multiple distractors (e.g., nature sounds, music). Training days 3–6 were presented at −5 dB SNR and days 7–10 were at −10 dB SNR. Error bars are standard error of the mean.
