○  TED英语演讲稿：四种影响我们的声音方式  ○

　　声音有愉悦的也有刺耳的，Julian Treasure给我们展示了声音4种影响着我们的方式。仔细听，你将会发现有关我们开放式的、嘈杂办公室的一些令人惊讶的事实。

　　Over the next five minutes, my intention is to transform your relationship with sound. Let me start with the observation that most of the sound around us is accidental, and much of it is unpleasant. (Traffic noise) We stand on street corners, shouting over noise like this, and pretending that it doesn't exist. Well, this habit of suppressing sound has meant that our relationship with sound has become largely unconscious.

　　There are four major ways sound is affecting you all the time, and I'd like to raise them in your consciousness today. First is physiological. (Loud alarm clocks) Sorry about that. I've just given you a shot of cortisol, your fight/flight hormone. Sounds are affecting your hormone secretions all the time, but also your breathing, your heart rate -- which I just also did -- and your brainwaves.

　　It's not just unpleasant sounds like that that do it. This is surf. (Ocean waves) It has the frequency of roughly 12 cycles per minute. Most people find that very soothing, and, interestingly, 12 cycles per minute is roughly the frequency of the breathing of a sleeping human. There is a deep resonance with being at rest. We also associate it with being stress-free and on holiday.

　　The second way in which sound affects you is psychological. Music is the most powerful form of sound that we know that affects our emotional state. (Albinoni's Adagio) This is guaranteed to make most of you feel pretty sad if I leave it on. Music is not the only kind of sound, however, which affects your emotions.

　　Natural sound can do that too. Birdsong, for example, is a sound which most people find reassuring. (Birds chirping) There is a reason for that. Over hundreds of thousands of years we've learned that when the birds are singing, things are safe. It's when they stop you need to be worried.

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