No, I think you might be right too . . . I just never thought of it that way. According to that Wiki site I posted:

"Proprioception is tested by American police officers using the field sobriety test where the subject is required to touch his or her nose with eyes closed. People with normal proprioception may make an error of no more than 20 millimetres. People suffering from impaired proprioception (a symptom of moderate to severe alcohol intoxication) fail this test due to difficulty locating their limbs in space relative to their noses."

"Proprioception is what allows someone to learn to walk in complete darkness without losing balance. During the learning of any new skill, sport, or art, it is usually necessary to become familiar with some proprioceptive tasks specific to that activity."

Based on that . . . I'm guessing, but it may be proprioception that could cause a person to not be able to balance in the dark too. I've just never thought of it that way.

OR . . . maybe what I have is something different.

Cherie