I agree, it is very very obvious that chickens have emotions. I’m sure anyone who is in this forum spends enough time with their chickens to know that. And anyone who has spent ANY length of time with a dog, knows they for sure have emotions.The way I was reading it was that you can't really tell how they are feeling. We can think they are feeling a certain way but we don't actually know what it means for each individual bird. Just like in humans each bird may express the same thing differently (ex. some people laugh when they are nervous, while others sweat, and others fidget).
I may be wrong though.