Could you eleborate?
what does mouse sensitivity mean?
I think he meant how fast or slow the mouse moves and affects things.
Like, with the keyboard controls. If you press a key to left, how far left does an object/sprite move or reacts, etc.
With the mouse would be... the cursor? Or a sprite/object following the direction of the mouse? Like, if you move the mouse up and down how fast the sprite/object would of react to it following the action.
I think that's what he meant though.