Knocked out, condition modifier, where in the rules? Options

[Larsenex]

This sounds like a no brainier but I really cannot find it anywhere in the book. If you exceed the stun condition modifier it spills over to physical. I get that.

But I can find nothing in the rules that says, if your stun condition modifier is full or exceeded that you are knocked out/unconscious. It 'seems' its implied but its not actually stated anywhere. Even in the stun spells it says, these are like sleep spells but nothing I can find says once I fill up all of your stun condition boxes does it say you are knocked out.

I guess I am missing it which is why I am coming here.