I agree about definition confusion. I like to define consciousness as "capability to suffer".
Can cow/dog/spider suffer? - very important question, even if not answerable.
At least mammals do show recognizable signs of pain and suffering. That is good enough for me; I don't know for sure other people can suffer, but I assume they do based on their behavior I see.
At least mammals do show recognizable signs of pain and suffering. That is good enough for me; I don't know for sure other people can suffer, but I assume they do based on their behavior I see.