为什么我们有两只耳朵？

我们的两只耳朵就像是收X讯站，将接受到的声音讯息传送至大脑，左耳传至左脑，右耳传至右脑。
当耳朵接收到声音后，大脑可计算出角度，得知声音是从哪裡传过来的。大脑可分辨出邻近声源的耳朵比对侧耳朵几微秒接收到的时间差异。当只有一只耳朵聆听时，声源的分辨就无法达成。更重要的是，两耳同时聆听声音的音质会较佳，只透过单耳接收语音时，声音听起来会比较平坦以及缺乏丰富的声音内容。大多数来说，两耳都有听力损失时，好同时配戴两只助听器。

美国听力学会建议：

双耳佩戴助听器；众所周知，音乐和言语的立体声效果更佳。双耳听力受损的话，双耳佩戴助听器会       产生立体声的效果。如果您的双耳听力受损，建议双耳选配助听器。相比单耳佩戴，双耳佩戴有以下好 处；

对声音准确定位

单耳佩戴者听到背后汽车的声音，确不能判断汽车是从哪一侧开过来，这是件危险的事情；而双耳佩         戴就不会出现这样的情况。

保护剩余听力

仅仅单耳机佩戴，会过度依赖佩戴助听器的一侧耳；对侧耳长期得不到锻炼，残余听力会逐步丧失，        这就是医学中的“听觉剥削”现象。

更容易听清言语的内容

双耳佩戴可以消除“头影效应”，减少头部对高频声音的阻碍，更容易听清和粪便言语的内容。

聆听过程更轻松不费力

单耳佩戴者听小的声音比较费力，耳双耳累加则可以提高声音的总体响度，听小声也不费力。

在噪音环境里更容易听清

双耳聆听会产生立体声效果，您听到的言语声更自然，音乐声更美妙。

 

 

1,399人评论了“双耳聆听的优势”

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