- 2,283
- 3
honestrosewater said:In a pure Life world, it must be like something to detect "on" and/or it must be like something to detect "off". It has to be known that this state is "on" (or this state is "off"). It isn't enough to know "on" is not "off" and "off" is not "on".
A system in a pure Life world could detect whether a certain cell was on or off at a given time step by observing the causal dynamics of the surrounding cells over time. The point is that there is nothing more to the ontology of on and off than just their differing dispositional properties over time.
Detection of 'on' in a pure Life world does not imply that it is like something (in the sense of Nagel) for the detecting system to detect 'on.' You seem to be using a much broader and more colloquial sense of the phrase that is not faithful to Nagel's usage.
Edit: Can I say that Rosenberg deals with three things: (1) formal systems, (2) interpreted formal systems, and (3) instantiated interpreted formal systems?
It would be more accurate to say that he deals with 'pure' formal systems and our universe, which he argues is not a pure formal system. (2) and (3) do not really add anything to (1); they do not tell us anything that doesn't already logically follow from (1). If something about (2) and (3) did not follow from (1), then we would have some sort of strongly emergent phenomena on our hands, and we'd have to add some extra rules to the rules already contained in (1). But that would break our stipulation that (1) is already the complete set of rules. So by definition, everything about (2) and (3) logically follows from (1) (given some set of initial conditions).
He examines a pure Life world as (1) and an impure world as (3) (when appealing to our subjective experience of qualia), but where does he examine a pure Life world as (3) or an impure world as (1)?
Examining a pure Life world as (1) is equivalent to examining it as (3), since everything about (3) logically follows from (1), by definition of what it means to be a pure Life world. On the other hand, it is up for grabs whether our world is a pure physical world; what we have to do is observe it (I suppose this meets your criterion for (3)) and see whether what we observe can follow from (1), the formal rules given by physics.
edit: Sorry, let me clarify something here. The initial conditions of any given Life world will not follow from the rules governing its evolution; to get a Life world off the ground, we need to suppose some set of initial conditions in addition to the dynamical rules. If this is what you meant by (2), then (2) does not logically follow from (1). But (3) certainly follows from a combination of the rules and a set of initial conditions. In any case, the basic point stands that nothing is really to be gained from an analysis of the evolution of a particular Life world. The argument is an argument in principle, and will apply to any instantiation of any given pure Life world.
Rosengogue: No, wait, come back. This system has something we can interpret as being you, as playing the role of you.
Me: And this system still doesn't have anything that plays the role of qualia?
Rosengogue: No.
You seem to be missing the essential point of the argument, which is that there is more to qualia than just whatever functional or dispositional roles they may play in a cognitive context. The physical causal dynamics of your zombie twin are identical to your own, so (barring interactionist dualism) if qualia play some effective causal role in you, there will be a corresponding effective causal role in the zombie. What is different is that the playing out of causal roles in you is associated with what it is like to be you (i.e. your p-consciousness), whereas for your zombie twin there is no p-consciousness associated with the causal roles; it's just the effective causal roles and nothing else.
Last edited: