Methods The speech discrimination scores of Cantonese lexical tones were compared between two patients with unilateral and bilateral cochlear implants at different signal to noise (S/N) ratios.

• 方法 用 2例双侧人工耳蜗植入者比较双侧与单侧人工耳蜗在不同信噪比下对广东话声调的辨别能力。