Can you measure muscle movement by measuring brain activity?

try researching EMG graphs.

There are a number of pain scales (see below for an interesting list), most of which have limited use in modern medicine. My 'favorite' of these has to be the 'Schmidt Sting Pain Index'. While being tongue-in-cheek, it does have a useful application in measuring ant stings: 1.0 Sweat bee: Light, ephemeral, almost fruity. A tiny spark has singed a single hair on your arm. 1.2 Fire ant: Sharp, sudden, mildly alarming. Like walking across a shag carpet & reaching for the light switch. 1.8 Bullhorn acacia ant: A rare, piercing, elevated sort of pain. Someone has fired a staple into your cheek. 2.0 Bald-faced hornet: Rich, hearty, slightly crunchy. Similar to getting your hand mashed in a revolving door. 2.0 Yellowjacket: Hot and smoky, almost irreverent. Imagine W. C. Fields extinguishing a cigar on your tongue. 2.x Honey bee and European hornet: Like a matchhead that flips off and burns on your skin. 3.0 Red harvester ant: Bold and unrelenting. Somebody is using a drill to excavate your ingrown toenail. 3.0 Paper wasp: Caustic & burning. Distinctly bitter aftertaste. Like spilling a beaker of hydrochloric acid on a paper cut. 4.0 Pepsis wasp: Blinding, fierce, shockingly electric. A running hair drier has been dropped into your bubble bath. 4.0+ Bullet ant: Pure, intense, brilliant pain. Like fire-walking over flaming charcoal with a 3-inch rusty nail in your heel.