I don't get you're point, I read it before posting. It's a study on intelligence.Very good read. It is not saying that chickens are smart or intelligent. They can be cognitively changed with reinforced behavior such as roost before oats, They come to see intheir own that when they do something they get something. That is the reinforced behavior that we all want. Pure Psychology and same as for humans. you cannot put a plate in front of a child and never model what to do with it. You have to model and show and give clues as to what to do. That is the way we learn. Big story as forever I have heard about a child left in teh wild will not learn to speak. Same if a child is never spoken to, they will not learn to speak but however will make sounds because it is in DNA and part of teh original cognitive code. It is all about repetition. I only have to look at my dog if she is near the table at dinner time and she knows to make a v line the other side of teh house. She is not allowed to watch me eating nor anyone at all. It took a long time but I keep reinforcing the behavior I want by later giving her some leftovers or a treat. All animals can learn some type of conditioning. The earlier it starts, the more successfull you become.
I understand it's you're opinion though.