I agree that the explanatory gap is conceptual and not necessarily ontological. The gap is a feature of our descriptions of the world. From the time Galileo proclaimed that “the book of nature is written in the language of mathematics,” the scientific enterprise has progressively bracketed the first-person perspective in favour of third-person description – and, it needs to be said, with breathtaking results.
But should we really expect science to account for what it has bracketed by design? Perhaps our instinctive drive towards progressively unified accounts of the world, reinforced by the extraordinary success of science, seduces us into thinking that science will eventually account for everything. Perhaps that is simply our instinct for explanatory completeness overstepping its remit. In that case, closing the explanatory gap is not a task that science, considered on its own methodological terms, can adequately formulate. But that wouldn’t constitute a “failure of science” – it would simply mean that science is not, by itself, the tool for this particular job.
So, phenomenology doesn’t appear in the relational structure described by RQM, but does that mean that it cannot appear in any kind of descriptive account? I don’t think so. “Unimaginable” doesn’t mean impossible. The fact that we can’t currently conceive of a conceptual bridge between phenomenology and physics establishes a difficulty of description, but it doesn’t by itself establish an ontological impossibility. A claim for impossibility seems like quite a leap, but it’s worth examining if we are to avoid turning science into a new kind of religion.
Forgive me for restating my position, but I want to make clear that I regard the relational structure described by RQM as real, pre-cognitive and evolving. I’m therefore not subscribing to a von Glasersfeld-style agnosticism about reality, nor am I advocating substance realism, let alone substance dualism. Indeed, the more I look for a satisfactory ontology that somehow “closes” the gap, the more I’m driven towards the possibility that there isn’t one.
I would describe my own position as being closer to the Jamesian mould. This seems to sit surprisingly comfortably alongside both RQM and Ladyman’s OSR, although I don’t mean to suggest that they are saying the same thing. Whitehead, of course, doesn’t need to “close the gap” in quite the same way, because experience is implicated from the beginning in his notion of “actual occasions of experience.”
But here’s the position I’m increasingly leaning towards…
If RQM is “all there is” in the relevant sense – if there is no reality standing outside the relational structure from which that structure can be viewed – then the appearance of an explanatory gap cannot itself occur outside that structure. The very distinction between first-person and third-person perspectives must itself be something that occurs within it.
RQM makes facts relative to interactions. There is therefore no absolute centre from which the entire network can be surveyed. It is, in that sense, a map without a centre – there are only internal perspectives on the network, and no God’s-eye view of the network from outside it.
Perhaps, then, the explanatory gap is not a “problem looking for an explanation” at all. Nor is it necessarily a category error. It may instead be a structural feature of a relational reality in which every perspective is internal to the network it describes. From one kind of description, we might say that the centre has only a conventional existence and is empty of inherent existence. From another, we might simply say that there is no privileged standpoint from which the relationship between all perspectives can be made absolute. I know this doesn’t close the gap, but maybe we’re wrong to expect it to close in the first place.