When you look at non-human animal communication, for instance birds and cats, you can explain what's going on simply in terms of cause and effect. Now, human language is more complex, but if you happen to have determinist beliefs, at some level you believe it's all cause and effect, right? So, when describing why and how people use words, would an ideal observer need to talk about the meanings of words at all, or would the concept of meaning drop out as unnecessary?