Use external stimuli.

使用外在刺激。

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Don't react to these external stimuli, simply notice them.

不要对这些外部的刺激做出反应，只是简单的留意它们。

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In some cases, it can be possible to use external stimuli to change the direction of a dream.

在一些案例中，运用外在刺激来改变梦的方向是可能的。

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The color red is believed to increase receptiveness to external stimuli, which could affect a person's emotional and motor responses, researchers said.

WSJ: The Secret to An Afternoon Energy Boost: Red Lighting

And the researchers believe it is possible that this interaction may change vital nervous system functions, including how quick it is to react to external stimuli.

BBC: Cot death remains a mystery

Using a technique called functional magnetic resonance imaging (fMRI), the researchers were able to record the brain's activity in response to internal and external stimuli such as eating and drinking.

BBC: Obesity