Oddly Wired
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emotion

You consistently mispredict how long your emotional reactions will last.

People significantly overestimate how long they will feel sad after a breakup or happy after a promotion.

Affective forecasting shows that our brain ignores the 'immune neglect' factor. We forget that our daily life and its routines have a strong baseline pull that returns us to normal faster than expected.

Your future grief will be shorter than you think.

Where this comes from

Study
Gilbert et al., 1998
What the check found
The claim accurately reflects the core finding of Gilbert et al. (1998) regarding immune neglect and durability bias, although the provided text does not explicitly contain the quote.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.