当威胁被感知到以后，RAS自动选择相关的感觉输入，并将其送进较低的脑(也叫“爬虫的脑”)，那里的非自愿响应不是去思考，而是作出反应-战斗，逃跑，或僵硬地呆立不动。

When threat is perceived, the RAS automatically selects related sensory input and directs it to the lower brain where the involuntary response is not to think, but to react-fight, flight, or freeze.

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