and the key is it being SMOOTH muscle, it means unvoluntarily
as you learn to move yoour eye lens smooth muscle to unfocus you learn to move your brain smooth muscle to decalcify it
this is what a normal brain looks like:
edit:
in the end this is like the katy perry f you
you say she said thankyou- theres no muscle in the brain
i clearly heard f you- i can feel how i tense a muscle inside my head as i can tell when im moving my ears without looking in a mirror