The link between conditioned and general anxiety explain why anxious people are hyperattentive to possible threats, and how panic-prone people come to associate anxiety with certain cues.

The answer is: The link between conditioned fear
Our brain is conditioned to eliminate the source of our fear before we could fully rested because in the past the source of our fear usually comes from something that could physically harm us (such as wild animals, or potential attacks from other tribes)

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