It is a combination of many things obviously. What I object to is to try to explain the performances of a great visionary mind by finding physiological explanations. Any proposed effect of him having extra quick nerve signals or a broader peripheral vision is a lot more probable to stem from him being a professional hockey player than from any biochemical difference in his neurons.
Compare to Albert Einstein. Sure, he has an estimated IQ of about 160. But that is not the reason he excelled at what he does. To totally reinvent an entire field of science it was not enough just to be smart and have a good sense of logic. The reason he accomplished what he did is that he had a visionary mind that managed to see things that others did not. I don't think such a trait can be explained by scientific methods.
I think something similar applies to Wayne Gretzky and that is what's so fascinating about him. He wasn't a physical monster or a lightning fast skater. He just saw the game at a higher level than anyone before or after. Sure he probaby had very good reflexes and vision, especially in comparison to average people (I don't think this difference is as great in comparison to other professional hockey players, which is obviously not the comparison made in this study.). But I don't think that was what set him apart from the rest of hockey history.
To me the study is a quirky fact, but it explains nothing, it just cements what we already knew.
Interesting subject. I too would like to know more about the studies of Dr. Tatton. It would be interesting to compare Gretzky to other hockey players (professional or not), other sports people (table tennis, racing, football, etc.), and perhaps even guys spending lots of time playing computer/video games.
I was initially assuming Gretzky was compared also to other hockey players, but maybe he was about the only hockey player studied.
We know about autistic people having abilities like normal people don't have (as in the movie "Rain man"). I was thinking Gretzky was differing from other people in some similar kind of way, for example having a brain constructed to benefit hockey playing (rather than, as some autistics, which Gretzky is not, have extraordinary abilites like memorizing pieces of music, text or pictures).
I wrote some time ago about how a person's mind is important. I wrote about physical ability, "(hockey) intelligence" and mind. You can be physically gifted, and very intelligent in regard to read the play, etc. But often it is the mind that decides which ones continue to elite level and which ones don't. During school (especially age 7-15), there were guys who was very good at football, having natural talent for reading the play and having the physical ability/skill to perform what they intended. But many of those guys didn't have the mindset to become successful at elite level, and finished their sports career or continued it at lower levels, while other less good guys structured their life in a way that made it possible for them - if not being too far behind the best ones - to perform at high level. I know quite a few World champions (or similar) in different sports, and they usually didn't stand out during young age.
I, and other people I know, have noticed that successful sportspeople tend to share some personality traits (if that's the right word). They obviously often very much desire to win, they often are very good at focusing, they are able to dedicate, structure and discipline themselves.
Sports people are often good employees or students. For example, I went to high school with a person who got to play for the national football team (senior), who had excellent marks (just one example out of quite a few). It seems as if some kind of structure, disciplin and dedication shows true at work and school too.
It is said about football player David Beckham (from England, famous for his free kicks) that he had some "complusive" desire to have things "perfect". After practices, he shoots free kick after free kick, often after the other guys have left the field.
Maybe there are other, better, examples.
It is probably hundreds of times that I've heard how successful sportspeople competes hard even when playing e.g. a game of cards. They "want to win!", and may not be nice to deal with if they lose.
But, I know of many cases where it doesn't seem to matter how much one practices. One guy may practice several hours a day on something. Then another guy, apparantly similar psysically, do the same things better at the first or second attempt.
Interesting info about Gretzky's dad. I saw him the other day, but didn't speak to him (as it was on TV I saw him.)