Silmarien
Existentialist
- Feb 24, 2017
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So how do we distinguish 'inherently goal-directed' behaviours from non-inherently goal-directed behaviours, what are the distinguishing criteria?
Perhaps we don't. Perhaps all of nature is inherently goal-directed. Though keep in mind that goal-directed doesn't necessarily entail conscious behavior--the chemical reactions that move an amoeba towards its food aren't an accident; they develop and are carried out specifically because the amoeba needs to eat. Where should we start with the chain of causality: the goal or the chemical reactions?
I'm fine with calling them different levels of description, but can we reduce one to the other? That seems to be what you're trying to do, and I'm unconvinced that you can avoid absurdities like the elimination of rationality or magical inexplicable jumps in functioning à la Intelligent Design with this approach.
We could say that two chemicals 'want' to react together in order to generate a product because one has electrons to share and the conditions are right, but when the 'reason' or 'motivation' obviously reduces to thermodynamics, it's hard to attribute agency... we generally reserve that kind of description for children, who seem to find it easier to understand the world in terms of agency and teleology.
Well, assuming that the motivation obviously reduces to thermodynamics. This depends upon what laws of nature actually are--if the camp that thinks they're descriptive rather than prescriptive is correct, then nothing actually reduces to thermodynamics. Thermodynamics is simply the way we're describing the interactions of physical substances that are in fact reacting based on their intrinsic natures.
The evolutionary explanation seems quite reasonable - creatures that tend to avoid dangerous or damaging stimuli have a selective advantage; multicellular creatures evolved nervous systems to coordinate their responses to environmental stimuli.
It may seem reasonable, but it's actually deeply flawed. Here's the problem:
Let's take two hypothetical amoebas. Amoeba 1 is a chemically driven specimen with no experience of hunger. Amoeba 2, in contrast, feels hunger.
What is the difference ontologically between Amoebas 1 and 2? This is the underlying question. In step one of our thought experiment, let us assume that they are chemically identical, but that Amoeba 2 mysteriously possesses sensation as well. If they are physically identical specimens, then is Amoeba 2's mysterious experience of hunger going to give it a selective advantage? What causal role is this strange Cartesian sensation going to be playing in Amoeba 2's eating habits? If behavior is determined at the physical level, then there is no effective difference between Amoebas 1 and 2. For the purposes of evolutionary processes, they are identical.
Now, perhaps Amoebas 1 and 2 cannot be identical. Perhaps additional chemical reactions are required for Amoeba 2 to feel hunger, so the physical make-up of the two amoebas must be different. So we can now posit that Amoeba 2 is somewhat different than Amoeba 1 physically, and that it is this physical difference that makes it more fit for survival. All well and good, but enter Amoeba 3: another amoeba that is physically identical to Amoeba 2, except without phenomenal experience. Once again, it is as likely to thrive as Amoeba 2, since all causality is occurring at the physical level, and we're off on an infinite regress of unhungry amoebas.
If the phenomenal can be reduced to the physical, then evolution cannot be invoked to explain the presence of phenomenal experience. If it is something additional to the physical that can be selected for by evolution, then we're into a form of dualism and worrying about immaterial causation.
Of course, we could also deny that Amoeba 1 is possible and say that at a certain level of development, the amoeba will automatically be hungry. But why would this be the case? It's not a development that we can attribute to evolution, for the reasons listed above. If there is a logical reason why physical systems are accompanied by phenomenal experience, it's going to go deeper than evolutionary advantage, and it's almost certainly going to land us outside of a strictly physicalist ontology.
I don't think anyone has satisfactory explanations for consciousness, qualia, etc. That's the 'hard problem'. I currently see it as, in Nagel's terms, that there is just 'something it is like' to be a creature doing this kind of information processing.
That's fine, but Nagel is a serious opponent of materialism, so I would worry about the coherency of a Nagelian flavored physicalism.
My problem with the 4D 'block' universe is why, if it all just is in a lump, should it show a spatial progression in the temporal dimension; i.e. why is each temporal 'slice' related to the previous and subsequent slices such that entropy appears to increase from slice to slice?
Ahh, yes. I have a somewhat similar problem with the Block Universe theory, if more observer based. There is no change, change is an illusion, but we will refuse to address the fact that your subjective experience of change is still an actual change that we need to account for. Enter lots of hand waving.
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