I found this research paper that roasted my brain:

🧠 "Selection of experience for memory by hippocampal sharp wave ripples."

Translation?
"Your brain isn’t here for the small stuff. It’s curating a highlight reel of your life while ghosting 90% of your daily nonsense."

Here’s how the scientists cracked the code:
1️⃣ They threw some mice into a figure-8 maze. Snacks were involved, obviously, because why else would a mouse care?
2️⃣ Then, they slapped dual-sided silicon probes on their tiny heads and recorded 4,469 neurons firing in their hippocampus
3️⃣ They made the mice run the maze 70 times!!!
These mice were literally grinding for science!👏🔥

The Findings:

1) Every maze run was unique:

• Even though the mice ran the exact same maze, their brain activity wasn’t just a copy-paste job.
• Every single maze run was a new neural remix, because your hippocampus doesn’t do boring.

2) Brains make maps:

• The researchers used this sci-fi-sounding tool called UMAP to make sense of all the neuron chaos.
• Think of UMAP as Google Maps for your brain.
• UMAP turned the neurons’ random firing into a clean 3D map that literally mirrored the maze.
• And when they color-coded it by trial number? You could literally see how the brain recorded each run in order, like a timeline of events.

UMAP > PCA. Period!
They tried PCA first, but PCA is basically your dad’s minivan: reliable but zero excitement.🤷🏻‍♂️
UMAP?
That’s the Tesla of data analysis.
Sleek, fast, and showing off all the neural details in glorious 3D.

SPW-Rs (Sharp Wave Ripples) : Your Brain’s Memory Gatekeeper!
The brain doesn’t save everything -- SPW-Rs do the hard work:

• While the mice were running, SPW-Rs were tagging moments like, “This is important, save it!”
• Later, during sleep, these same SPW-Rs replayed the “tagged” moments to lock them into memory.
• And if a moment wasn’t hyped by SPW-Rs while you were awake? It’s getting deleted faster than a bad selfie.

Basically, your brain is running its own FYP(For You Page), boosting the good stuff and ignoring the rest.

Facts!!!
→ Your brain is not your Notes app
It doesn’t save everything.
It’s more like TikTok — only the dramatic, rewarding, or interesting moments make it through.

→ Sleep = memory bootcamp
While you’re drooling on your pillow, your brain’s out here replaying its favorite scenes of the day, turning them into long-term memories.

→ Novelty wins
The more dopamine (aka reward, excitement, or drama) an event sparks, the more likely your brain is to keep it.
Boring stuff? it’s gone!

It’s not just about mice.
This literally explains why you remember the dumb drama from high school but can’t find your keys!

Check out the original paper: Paper

P.S.: Your brain’s out here remembering your ex but forget where you put your keys -- wild 🤷🏻‍♂️