(PDF) The Structure and Dynamics Argument against Materialism (downloadable at this link)
"The Structure and Dynamics Argument against Materialism"
TORIN ALTER
NOUS 50:4 (2016) 794–815
doi: 10.1111/nous.12134
"Physical truths concern only structure and dynamics and therefore cannot fully
explain consciousness.1 That is the core idea of David Chalmers’ structure and dy-
namics argument.2 This argument plays an important role in Chalmers’ critique of
materialism, which he begins by arguing that there is an epistemic gap between the physical and phenomenal domains, based on considerations such as the conceivability of zombies and the incomplete knowledge of Mary in her black-and-white room.3 He then argues that this epistemic gap leads to an ontological gap, so that materialism is false.4 In response, some materialists (so-called type-C materialists) argue that while there is a prima facie epistemic gap that we are not currently in a position to close, it is closable in principle.5 Chalmers responds to these materialists by invoking the structure and dynamics argument.
However, the structure and dynamics argument does more than provide a re-
sponse to type-C materialists. In particular, the argument appears to serve as a sort
of foundation for a number of anti-materialist arguments, including the knowledge
argument, the conceivability argument, and the explanatory gap argument.6 But
the structure and dynamics argument is not well understood. In this paper, I will
explore and defend it. In section 1, I will discuss its nature and significance. In
section 2, I will describe some ways materialists might reject its main premises. In
section 3, I will defend it against recent objections by Daniel Stoljar (a leading
proponent of type-C materialism) concerning the notion of structure. I will close
in section 4 with a remark about where the argument might lead.7
1. The Nature and Significance of the Argument
Chalmers presents the structure and dynamics argument in a number of places, but
the definitive version appears in his 2003 article “Consciousness and its Place in
Nature”.8 As presented there, he begins with the claim that physical descriptions
characterize the world in structural-dynamic terms. He explains what this amounts
to as follows:
"A microphysical description of the world specifies a distribution of particles, fields, and waves in space and time. These basic systems are characterized by their spatiotemporal properties, and properties such as mass, charge, and quantum wavefunction state. These latter properties are ultimately defined in terms of spaces of states that have a certain abstract structure (e.g., the space of continuously varying real quantities, or of Hilbert space states), such that the states play a certain causal role with respect to other states. We can subsume spatiotemporal descriptions and descriptions in terms of properties in these formal spaces under the rubric of structural descriptions. The state of these systems can change over time in accord with dynamic principles defined over the relevant properties. The result is a description of the world in terms of its underlying spatiotemporal and formal structure, and dynamic evolution over this structure."9
Following Chalmers, though omitting some complexities to be discussed later,
we could put this by saying that structural-dynamic descriptions are those that are
analyzable in formal, spatiotemporal, and nomic terms, where the formal is the
logical and the mathematical, and the nomic is the domain of laws and causation.10 To a first approximation, we might think of the structural as the spatial and the formal, and the dynamic as the temporal and the nomic. I will return to the question of just what counts as structure and dynamics below, in section 3.
Chalmers goes on to argue that the structural-dynamic nature of physical truths
precludes them from fully explaining consciousness. He summarizes the argument’s main claims as follows:
"First: Physical descriptions of the world characterize the world in terms of structure and dynamics. Second: From truths about structure and dynamics, one can deduce only further truths about structure and dynamics. And third: Truths about consciousness are not truths about structure and dynamics.11"
What might those claims establish? . . . ."