失歌症[1]又称失乐症[2]、旋律辨识障碍症[3]，是一种无法准确把握音调、记忆和识别音乐的症状。[1][4]失歌症主要有两种类型：后天性失歌症（由于脑损伤而产生）和先天性失歌症（出生时就无法准确识别音乐）。研究表明，4%的人患有先天性失歌症。 [5]
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