The Nature of Talent?

I was reading through the latest issue of Discover and during an interview with neurologist Oliver Sacks he mentioned a period of his life when he was taking a huge amount of amphetamines:

"I got into a very strange state for two weeks, a state in which I, who cannot draw, found myself able to do the most accurate anatomical drawings. I have a notebook from that time full of anatomical drawings of a sort I had never done before and have never done since. This also affected things like musical reproduction and sense of smell. I could recognize most people and most places by smell. And so I did have an experience myself of having various perceptual powers released. When it all disappeared, I had mixed feelings. It was a great relief, and also some regret. However, I think the amphetamines are terribly dangerous, and I'm glad I survived that time."

I had generally assumed that artistic talent was a combination of heredity and learned skill, in various degrees. While that's probably still the case, the idea of artificially unlocking previously unknown and undisplayed technical skill, and what that then means about the nature of talent, is fascinating to me. How much of pure artistic talent is born out of perception?