Proprioception

Ardem Patapoutian talking about proprioception in this interview where he discusses about his Nobel prize for medicine.

The simplest test is to close your eyes and touch your nose. If you think about how you’re able to tell where your fingers are with your eyes closed, you realize it’s because of how much your muscles are stretched. It’s the same sensor, Piezo 2, that senses this. You don’t feel that the muscle in your second finger is stretched, but rather you gather all the information, and your brain forms an image of where you are and what space you occupy. And that’s why, easily, without looking, you can walk, run, play soccer, play the violin. You can do all of this thanks to proprioception. And we take it for granted because you can’t turn it off. You can close your eyes and imagine what a blind person is like, but you can’t turn off proprioception. That’s why most people don’t know about it, because it’s always there. And it’s a big philosophical message: we take things for granted when we always have them.