During the experiments, the test subjects wore headphones and listened to noise at either a high or low audio level.

研究人员要求实验对象头戴音量大小不一的耳机。

So audio levels are reduced by about 20%, and strobe lights are completely eliminated.

因此，音频电平降低了约 20%，频闪灯也被完全消除。

The study found that subjects who listened to the higher volume noise ate more pretzels than those with the low audio levels.

结果发现，听高音量的实验对象比听低音量的实验对象进食多。