But as one does, an internal world opens up. It's a world of sensation, and a world of space. It is not a world of words or thoughts.

但是，当做这个练习时，一个内在的世界向你展开额，这是一个意识的世界，是一个有关空间的世界，没有语言，没有思想。

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For Greenfield, a conscious experience occurs when a stimulus — either external, like a sensation, or internal, like a thought or a memory — triggers a chain reaction within the brain.

根据Greenfield的观点，当某种刺激——要么来自外部，比如一件耸人听闻的事件，要么来自内部，比如一种想法或者记忆——在大脑中触发了一个连锁反应，意识就产生了。

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