How do you know enough about matter and neurons to know that it relates to consciousness in the way that adding positive numbers relates to negative numbers or apples?

It's our theories of matter which are the problem - and which are clear enough for me to say that something is missing. My position as stated here actually is an identity theory. Experiences are a part of the brain and are causally relevant. But the ontology of physics is wrong, and the attempted reduction of phenomenology to that ontology is also wrong. Instead, phenomenology is giving us a glimpse of the true ontology. All that we see directly is the inner ontology of the conscious experience itself, but one supposes that there is some relationship to the ontology of everything else.