It would be interesting to hear what they consider "normal" socialization. Reading between the lines, it sounds like they are talking about kennel-raised dogs. I hope every one on this GROUP knows that they should steer clear of kennel raise puppies. Puppies should be raised in a home environment, exposed to EVERYTHING. And every good breeder that I know personally imports as many "new faces" as possible to play with and interact with the puppies. ...Not just the breeder and family, but outside guest too, and certainly NOT just "when the puppy wants to interact". A puppy who doesn't want to interact with people needs even more exposure!
In fact, more and more of the better Havanese breeders I know are incorporating "Puppy Culture" practices into their litter raising... including ENS and more. And this is not only people who swallow the kool-aid and become total PC worshippers. There is a LOT of good in the PC program, whether you buy into the whole thing or not.
Even the good Havanese breeders I know who have not bought into ENS and a more rigorous, disciplined, socialization program, do way more than it sounds like what they are calling "normal" socialization in this article.
I guess it's nice to know when "science" decides to "prove" something that good breeders know, and have been doing,for years.
It IS a great idea to remind people looking for puppies how important this aspect is when choosing a breeder, however. Yet another reason why puppy mill puppies start with so many strikes against them.