Without a concept for “Fear,” you cannot experience fear.”
This quote seems particularly stark to me in making clear that it is important to define what is meant by this word "concept" because the view expressed here is almost certainly not the view that is implicit in the ancient debates, where by my reading a concept is something formed after thought based on experience.
Now fear is an emotion / feeling and a human would most certainly experience fear as a natural feeling before ever thinking and describing the experience in words, which seems to be a central part of concepts.
Use of Feldman Barrett or anyone else to describe the processes actually involved will be helpful, but I also think to keep the conversation on course we have to focus on the debate in traditional terms, and there it seems to me that the word concept is closely related to "ideas" and "forms" and the ultimate questions of whether there are external locations (realm of ideas, religion/gods, formal logic /virtue) to which we must conform our thoughts and actions.
On the other hand focusing on what is actually going on is obviously good, so there's a balance involved!