There's a reason songs get stuck in your head, and a reason it's almost always the chorus, not the whole song.
Your brain treats unfinished things as open loops it needs to close. The chorus is the easiest piece to half-remember, so the brain keeps looping it, trying to "complete" the song.
Researchers at Western Washington University found that the fix is counterintuitive: instead of fighting the loop, just listen to the full song once, start to finish. The loop closes and the brain lets it go.
Same mechanism as the Zeigarnik effect, the reason an unsent reply nags you more than one you've actually sent.
Your brain won't let you rest until you complete that side project.
In the 1920s, psychologist Bluma Zeigarnik noticed something odd at a Vienna café: waiters remembered unpaid orders perfectly, but forgot them the moment the bill was settled. She tested this in the lab - turns out, our minds hold onto unfinished tasks far more vividly than completed ones.
That nagging feeling at 11pm that you forgot something? Your brain keeps open loops active so you don't drop them.
It was a useful feature in a savanna. But it's obviously less useful when you have 47 open tabs, three half-written messages, and a side project from 2022. 😁
The fix isn't finishing everything (impossible).
Studies by Masicampo & Baumeister showed that simply writing down a specific plan for an unfinished task (when, where, how) frees the mind from rehearsing it. The brain treats the plan almost like completion.