当研究人员在第二和第三晚重复实验室里的实验时，他们发现在深度睡眠时左脑不能以同样的方式受到刺激。
When the researchers repeated the laboratory experiment on the second and third nights they found the left hemisphere could not be stimulated in the same way during deep sleep.
第二种技术依赖于诱发电位；根据它们的源头，诱发电位是一种可能与特定的刺激相关的脑电反应。
The second technique relies on evoked potentials, which are electrical brain responses that may be related to a particular stimulus because of where they originate.
贝利说，如果经济再次开始萎缩，就有充分的理由实施第二次刺激方案——奥巴马政府希望他们不必这样做。
If the economy starts to shrink again, Baily says, it would make a strong case for a second stimulus—something the Obama administration hopes will not be necessary.
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