No idea. Topics like this should be discussed citing serious psychological studies (for example, beating of a certain degree have been shown to diminish a person's IQ - obviously, I'm a dumb idiot, so I can't cite any scientific article on that as of now), otherwise what's the point?

I was never spanked by my parents (I'm 21), neither is my 12 year old brother. I used to be quite "involved" in physical conflicts in school when I was a kid, as victim, perpetrator and/or mutual entertainment by engaging in "gang fights" (of no real serious degree of danger - t'wasnt NYC ghetto, yo), so not sure how that'd worked out under these or different circumstances...

but those days are long gone, and I'm in no way aggressive or abusive to anyone by now (sometimes we sort of shout at each other in the family, but mostly it's just mutual criticism over minor issues and not much more than blowing off a bit of steam - no children involved), and neither has my bro ever been.

I have somewhat of laziness / internet/entertainment addiction problem myself, but I'm successfully working on it and the only thing that "helps", if anything, is outside pressure to get stuff done.

My brother manages school, but spends a bit too much time on videogames and TV - needless to say, flaws like that are FAR removed from the borders of the "spanking territory". Discipline and working ability is gained by active thought, ego, motivation and resulting in HABIT.

But hey, maybe we just happen to share a non-aggressive personality, and are lucky to grow up in a violence-free environment?