GE Morton wrote: ↑September 20th, 2022, 6:46 pmConsul wrote: ↑September 19th, 2022, 9:25 pm
The statement that
all entities are physical/no entities are nonphysical is ambiguous between
eliminative physicalism and
reductive physicalism about the mental: According to the former,
there are no mental entities—end of story; and according to the latter,
there are mental entities, but they are (identifiable with) complexes of (neuro)physical entities. Reductive physicalists are psychological realists, but they believe that the obtaining of a psychological state of affairs
Spsy consists in nothing more than the obtaining of (a plurality of) certain (neuro)physical states of affairs
Sphy1 + … +
Sphyn, such that
Spsy =
Sphy1 + … +
Sphyn.
So the psychophysical relationship is determined by
composition rather than (emergent upward) causation.
One problem with the latter analysis ("reductive physicalism"), which I've mentioned before, is that mental phenomena have different properties from the neural entities and processes that generate them, e.g., neurons have mass, thoughts do not; percepts have colors, neurons do not (at least, not the colors of the percept). Hence the former must be "something more" than the latter.
If percepts are the same as the qualia-bearing mental
objects postulated by traditional sense-datum theory, then reductive materialists deny their existence. There aren't any colored percepts—nor are there any (intrinsically) colored neurons; there are only visual sense-impressions/sensations that are
experiential properties ("passions") of (animal) organisms, all kinds of which are
dynamic structural neural properties of (parts of) their brains that don't involve any neurologically irreducible mental qualities.
Anyway, by saying that "neurons have mass, thoughts do not," you are comparing the wrong things. For neurons are
objects (substances) and thoughts qua thinkings are
acts or events; and it is certainly a category mistake to ascribe mass to acts or events. What can have a mass is
the substantial substrate of an act or event, but not
the act or event (as a whole). For instance, the Titanic was a massy
object, but its sinking wasn't a massy
event. Correspondingly, thinkings
as mental acts or events involve massy neurons
as their substrates, but they are certainly not massy
themselves.
Reductive materialists don't identify thinkings/thoughts with
neurons qua objects, but with
certain highly complex neural events, whose substrates are neurons. But properties of
objects (substances) functioning as substrates of events (or processes, or states, or facts) are not to be confused with properties of
events (or processes, or states, or facts)!
QUOTE:
"The very notion of a sense datum, at least as this is conceived by the phenomenalist, is suspect. (So is that of a mental image.) Do we really have sense data? Yes, in the sense that there are certain events that we call the having of sense data. No, in the sense that there is nothing in the world that is had. 'Having a sense datum' refers to an event, but the phrase is misleading."
(p. 115)
"I hold that sense data and mental images are not part of the furniture of the world, though havings of sense data and havings of mental images are."
(p. 115)
"…but the semantics of sense datum talk and mental image talk is not so easy, if we want to avoid an ontology of sense data and mental images, as I do."
(p. 116)
"My main objection to sense data and mental images, if conceived as furniture of the world, is, as I have said, that they do not fit into a scientific picture of humans and higher mammals. Conscious experiences are a mystery unless we are able to identify them with brain processes."
(p. 118)
(Smart, J. J. C.
Our Place in the Universe: A Metaphysical Discussion. Oxford: Blackwell, 1989.)
"I do not deny that experiences exist. I believe that experiences are brain processes and since brain processes exist so must the relevant experiences. What I deny is that experiences have non-physical properties (qualia)." (p. 158)
"One might talk of a red, white and blue sense datum, but I contend that there are no such things as sense data and mental images. There is only havings of them." (p. 160)
(Smart, J. J. C. "Ockhamist Comments on Strawson." In: Galen Strawson et al.,
Consciousness and its Place in Nature, edited by Anthony Freeman, 158-162. Exeter: Imprint Academic, 2006.)
:QUOTE
GE Morton wrote: ↑September 20th, 2022, 6:46 pmThere is no need for "mind talk" to be reducible to "brain talk," or brains identical with minds, in order for brains to be the
cause of mental phenomena.
The neurological reductionism about mind/consciousness affirmed by reductive materialists is essentially
ontological, not semantical or terminological! That is, they needn't claim that all psychological terms or sentences are translatable into and replaceable by neurophysiological ones.
If you
mischaracterize the doctrinal content of reductive materialism, it becomes an easy target; but it deserves to be characterized
correctly. Erecting and attacking a straw-man version of it makes things much easier for its opponents, but they should deal with
the real thing instead!
QUOTE:
"Physicalism may be characterized as a reductionist thesis. However, it is reductionist in an ontological sense, not as a thesis that all statements can be translated into statements about physical particles, and so on."
(Smart, J. J. C.
Our Place in the Universe: A Metaphysical Discussion. Oxford: Blackwell, 1989. p. 81)
"In taking the identity theory (in its various forms) as a species of physicalism, I should say that this is an ontological, not a translational physicalism. It would be absurd to try to translate sentences containing the word ‘brain’ or the word ‘sensation’ into sentences about electrons, protons and so on. Nor can we so translate sentences containing the word ‘tree’. After all ‘tree’ is largely learned ostensively, and is not even part of botanical classification. If we were small enough a dandelion might count as a tree. Nevertheless a physicalist could say that trees are complicated physical mechanisms."
—J. J. C. Smart:
https://plato.stanford.edu/entries/mind-identity/
:QUOTE