Also, if you put your hand palm down on a flat surface, then lift your palm so your finger tips are firmly on the flat surface, you will be able to lift all of your fingers independently of one another.
Now, put your middle finger's second knuckle flat on the surface, while keeping your other fingertips firmly against the flat surface. You will no longer be able to lift your ring finger at all.
I can actually lift my ring finger while doing this. It's not as high as the rest but I can do it.
I can do it with my left (non dominant hand) correctly. I can do it with my right (dominant) hand, but not so well. My other fingers don't curve down, I just can't get the pinkie down below a 90 degree angle.
Also, if you put your hand palm down on a flat surface, then lift your palm so your finger tips are firmly on the flat surface, you will be able to lift all of your fingers independently of one another.
Now, put your middle finger's second knuckle flat on the surface, while keeping your other fingertips firmly against the flat surface. You will no longer be able to lift your ring finger at all.
Also, if you put your hand palm down on a flat surface, then lift your palm so your finger tips are firmly on the flat surface, you will be able to lift all of your fingers independently of one another.
Now, put your middle finger's second knuckle flat on the surface, while keeping your other fingertips firmly against the flat surface. You will no longer be able to lift your ring finger at all.
I can still lift my ring fingers.
I attribute finger nimbleness to playing the piano.