The title says it all - does anyone know how muscle memory works, physiologically? I'm just curious because I think it's quite a neat trick

Not sure how it works except that it's the reason that you should use the same fingering (hopefully the correct one! ) every time you play the same phrase (talking as a pianist here......). Pupils just don't understand the importance of muscle memory.........and it's also why when you make large leaps on the piano (talking about the fingers/hands here - not acrobatics in case anyone had mental images of a pianist doing gymnastic routines on the lid....) the memory learns the distance required so you can do the leap along the keys with your eyes closed and still hit the correct note........ well.........usually.........

I think muscle memory is a misleading name. I'm sure a large part of it is a brain function but represents the point where a repeated action has become unconscious.

The detailed actions of writing with a pencil become unconscious in that you only have to think a letter and your hand can write it, you don't need to direct all the movements like a child does when learning. This would equate perhaps to the basic actions of playing a musical instrument for an experienced player - on a violin the basic placing of left hand fingers or basic bow stroke (can't do a clarinet example - sorry).

At a higher level signing your name is also in "muscle memory" and this perhaps corresponds to the memory of a particular series of notes in a well known piece or study. The difference being that if you suddenly panic in your signature and doubt the last three letters your "conscious memory" of your name can (hopefully) pull you through. If you suddenly get lost in the middle of the last movement of the Beethoven Violin Concerto it is a bigger challenge for the "conscious memory" to dig you out of the hole.

Eh?

100% with earplugs with this one. Muscles don't have memory, but it can feel as if they do when the actions become completely subconscious. For example, if you have to jump across the keyboard to play a difficult chord and you get it right, an onlooker might say "How can you possibly do that?" and you don't really know because it just happens. But it happens because you practised until it does without you thinking about it.

Yes, I agree with earplugs too. The same process happens with any complex combination of actions; learning to drive a car is a good example. The learner wonders how they will ever be able to co-ordinate hand and foot movements with watching the road ahead and looking in the mirror, whilst the experienced driver does all of that and is able to listen to the radio or conduct a conversation with a passenger simultaneously.

Thanks for the explanations. I thought I'd read that muscle memory was something to do with electrical impulses in the muscles, which is what I didn't understand but it sounds like I'm remembering incorrectly. What you've all said makes sense if it's a brain thing rather than a muscle thing. I'm not very good at biology/anatomy - I think the brain uses electrical impulses to send messages to, say, the fingers but I can see that that's not the same as the muscles themselves having electrical impulses (or not having, I should say).