“There is some level of the brain that doesn’t distinguish between reality and virtual reality. A typical example is, you see a precipice and you jump back and your heart starts racing. You react very fast because it’s the safe thing for the brain to do. All your autonomic system starts functioning, you get a very strong level of arousal, then you go, ‘I know it’s not real’. But it doesn’t matter, because you still can’t step forward near that precipice."