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。
Background and purposes: Tinnitus is an auditory phantom sensation experienced when no external sound is present.
背景与目的耳鸣是在无外界相应声源刺激时耳内有响声的一种主观感觉，发病率极高。
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