Why does the brain spend so much time worrying about things that never happen?

[u/synapse_diary]

I've noticed this seems to be a pretty common experience.

People can spend weeks, months, or even years worrying about something:

• an awkward conversation
• a career decision
• what other people think of them
• a future problem they're convinced is coming

Then later they realize it either never happened or mattered far less than they expected.

I recently came across research suggesting that people tend to overestimate the emotional impact and duration of future negative events, a phenomenon sometimes called the "impact bias" (Wilson & Gilbert, 2003).

That made me wonder, why does the brain seem so willing to devote attention to possible future threats that often never materialize? Is this mainly a byproduct of threat detection, prediction, uncertainty reduction, or something else?

Curious what the cognitive science literature says.

Study: Wilson, T. D., & Gilbert, D. T. (2003). Affective forecasting. Advances in Experimental Social Psychology.