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Much like a computer, your brain works best at a certain temperature, and tries to avoid "overheating". And it turns out yawning increases your heart rate, blood flow and the use of muscles in your face which are all essential to cooling the brain. On top of that, deeply inhaling cold air can alter the temperature of the blood in our head.
與電腦運作模式相似,大腦在特定溫度下才是最佳狀態,所以會盡量避免「過熱」的情況。而打哈欠能增加心跳速率、血流量,及臉部肌肉的使用,這些都是降低大腦溫度的必要條件。除此之外,大量吸入冷空氣能改變大腦中血液的溫度。
學習重點
2. yawn 呵欠
yawn
[jɔn] (n.) 呵欠
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