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It turns the human brain into a reptilian one and activates the sympathetic nervous system, putting us into fight-or-flight mode — the same one we can get stuck in when we’re chronically lonely.

This is part of the body's fight-or-flight response that has evolved to help us react quickly to the sounds like a predator crashing through the bushes.

"One common response to fear is fight-or-flight. When it comes to policy, the flight response is often to hide and do nothing, which fits comfortably with the conservative bent toward not changing social policy."

One common response to fear is the fight-or-flight response.

“Imagine that there’s a bear in front of you, and your fight-or-flight kicks on, right? And then the bear’s gone. Well, imagine if your brain stayed in fight-or-flight and every time you thought about the bear, another bear showed up in front of you. Then the more you think about it, the more bears there are, and they keep coming and keep coming,” Combs said.