Anything can "damage" a brain...If spanking was that harmful to the brain...

So, are you trying to claim anything can damage the brain, or that spanking isn't "that harmful" to the brain?

our species would never have survived since it used to be the traditional form of discipline...You are being a sensationalist once again @sterlinluxan

The term "brain damage" does not suggest that initiating force against children with no physical or emotional defenses would lead to the extinction of our species. The intellectual failure you demonstrate here disqualifies you from lecturing anyone on "sensationalism."

It is impossible to make a controlled experiment on the subject...For example this study demonstrates that they can do better in school. It comes to direct conflict with your "brain damage" post.

You exemplify a simple idiot when you attempt to discredit someone else's sources by saying the results cannot be verified for lack of a control group, and then offer up sources that cannot be verified because they didn't have a control group.

Physical Stressors can help a living being by making it stronger.

Then sign your kids up for soccer or football instead of hitting them.

some form of punishment with physical warning works.

It only works for lazy parents. For people who actually put effort into communicating and negotiating with their children, there's no need for physical violence.

Just because you feel a bit of lactic acid burning your muscles, it doesn't mean you are really hurting.

From a violent, caveman style perspective you're probably right. However it completely ignores the psychological and emotional damage that children suffer at the hands of the people they have no choice but to trust. It doesn't matter if your intent is to hurt them or just teach them a lesson, the only thing that matters is what it looks like from their perspective. They might learn their lesson, but they also learn what it feels like to be physically and emotionally betrayed by the first person they've ever trusted not to betray them.

You and your silly shit list will have to find space on the shitty-parent list that the non-violent members of society have to constantly drag around with them. Do the world a favor, don't breed anymore.