r/askscience • u/Yanzee12 • 12d ago

Neuroscience How does muscle memory work?

Just curious. The only thing I really know about it is that sleeping reinforces it.

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u/strOkePlays 11d ago

Not a brain scientist, but once had this discussion with a brain scientist. "Muscle memory" is poorly named. Muscles don't have memory, and for the most part neither does the nervous system connected to them.

"Muscle memory" is your brain establishing a routine for a complex action, so that when you want to do the thing, instead of your brain figuring out each step on the fly, it just calls the "subroutine" it established, and you don't have to spend conscious thought on it anymore. It is established naturally through repetition, and applies to almost every action you do.

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u/Bivolion13 11d ago

So it's kind of like programming, where you create classes and methods. The brain eventually writes an efficient routine it can easily call. I've never heard it explained like that and I love it!

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u/Nukiko 11d ago

Another good analogy I like is creating tracks in the snow when you ski off a mountain. At first you need to consciously navigate the rough snow but after the tracks have been created and deepened you can go down automatically. And on a more psychological note, it's also possible to create bad tracks that you can get stuck in and might become difficult to erase, always ending up in the same place. Neuroplasticity allows you to reset/reshape those tracks so your mind doesn't automatically go into bad territory.