Board Thread:Episode Discussion/@comment-14138255-20161211174540/@comment-27082610-20161216032855

The Devil&#039;s Advocate WP wrote: Humans don't seem to have their Aura unlocked naturally based on how the series has played out. Jaune is also implied to have used Aura based on his response to Pyrrha's partial explanation of it. Unlocking his Aura just meant he could use it in more ways than the basic ways all creatures used it. While Jaune had the ability to sense things before Pyrrha unlocked his Aura, he couldn't use its shielding or rapid-healing effects.

Depends on how you define "naturally". It seems entirely possible that early man discovered the ability by accident, breaking some internal mental barrier that allowed them to use the power of their soul to shape the world around them.