Language noob here. Just curious; does are body, while learning a language, make a distinction between spoken language and sign language? Or are they all just inputs and outputs to your brain? Each just as able to be incorporated in the language production/comprehension process?
Basically, from a language development standpoint, are our vocal-cords, tongue, glottis, etc. special? Or are they all just muscles; with your hands, feet, neck, etc. being just as valid to your brain?
Sorry if my question's sloppy. Still new to this part of SE. But you know, are our speech producing muscles inherently special, or just most commonly used in the language development process?