This link discusses interesting research that goes one step deeper into understanding creativity:
... creative people appear to be more open to incoming stimuli from the surrounding environment. Other people's brains might shut out this same information through a process called Latent Inhibition - defined as an animal's unconscious capacity to ignore stimuli that experience has shown are irrelevant to its needs.
The article says that both psychosis and creativity share this lack of latent inhibition, and this provides an explanation of the link between the two. I wonder if it also explains some of what is going on in attention deficit disorder.
(via Creative Generalist)