Nothing But Thinking Makes It So · Part Five · Chapter 17 · pp. 214–223
The Cost of Keeping the Line
Three defensible positions, three prices
What changed
While biology held the empirical monopoly, the line between conscious and not-conscious was free. It was supplied by the evidence, and no one had to argue for it. What ended was not the line but its zero price.
Anyone maintaining the line now selects, whether or not they notice the selection, one of three positions — and inherits its commitments.
Biological only
Consciousness requires carbon-based, metabolically living tissue.
Commits to
That the relevant property is the material rather than the organisation of the material. The position must say what carbon does that no other substrate can do, in terms that are not simply a restatement of the conclusion.
Price
It cannot appeal to functional evidence, because functional evidence is exactly what has become substrate-independent. It becomes a stipulation about matter.
Embodied only
Consciousness requires a single continuous body acting in a world at risk.
Commits to
That sensorimotor coupling and bodily stakes are constitutive, not merely typical. It has to hold the line against robotic embodiment, which supplies coupling and risk without biology.
Price
The boundary drifts. As embodiment is engineered, the position must either concede cases or keep adding requirements, and each addition is a further commitment to defend.
Suffering only
Consciousness requires the capacity to be harmed, and the mattering of that harm.
Commits to
That valence is the criterion and that it can be identified from outside. It must explain how suffering is detected in any system, including biological ones that cannot report.
Price
It is the strongest ethically and the weakest evidentially, because the criterion is precisely the one we cannot observe directly in any substrate at all.
The honest bookkeeping
The dishonest move is to hold all three at once, switching between them as each is pressured: appealing to biology when embodiment is engineered, to embodiment when substrate is challenged, to suffering when both look weak. A position that cannot be pinned cannot be wrong, and cannot be informative either.
The framework's own position is stated in Chapter 3: it does not draw the line at all. It judges content on merit and keeps responsibility human, which requires no verdict on interior experience in either direction.
A spoken treatment
The same argument, delivered rather than read.
Keep the line if the argument holds. Just stop describing the argument as an observation.