youdao

In addition, yawning when it is extremely cold may be maladaptive, as this may send unusually cold air to the brain, which may produce a thermal shock.

另外，在极度寒冷的时候打呵欠也许不大合适，因为这时通常会将冷空气送到大脑，从而使大脑发生热冲击。

youdao

Even if a cold drink was able to temporarily chill your brain a few degrees, it wouldn't be a big deal.

就算冷冻饮料能暂时把你的大脑降下个几度，那也不是什么大不了的事。

youdao

The researcher said that before the body begins to freeze, cold can cause changes in brain chemistry which lead to hallucinations.

VOA: special.2010.02.24

But my brain is so cold I can't remember if I did.

BBC: Chick Young's view

If a subject is presented with a sentence like, "When she came in from the cold her cheeks were like roses, " many sections of the brain become involved, including those responsible for visual processing.

WSJ: Book Review: Surfaces and Essences