Of Mice and Men

If you bite into rancid food, the insula activates, just as in every other mammal. You wrinkle your nose, raise your upper lip, narrow your eyes, all to protect mouth, eyes, and nasal cavities. Your heart slows. You reflexively spit out the food, gag, perhaps even vomit. 
Sapolsky, Robert M.. Behave: The Biology of Humans at Our Best and Worst (p. 713). Penguin Publishing Group. Kindle Edition. 

Man and mouse activate the same or at least analogous neural circuits in these reactions.  Humans do the same if they witness or think of something they find morally or esthetically disgusting.  Mice, probably not.

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