There is so much complexity to the brain that it's hard to imagine a time when we, as human beings, will ever really understand how much of it works. It's no surprise there's a lot going on "behind the veil" of consciousness, and I'm glad researchers continue to show this is the case.
Similar studies have shown that the subconscious can recognize ambigious shapes without the subject consciously becoming aware, solve problems completely before raising solutions to the consciousness, and more.
How exciting to be driven by (or driving, depending on what you believe) such a vastly complex thing.