41 ideas
2463 | A standard naturalist view is realist, externalist, and computationalist, and believes in rationality [Fodor] |
Full Idea: There seems to be an emerging naturalist consensus that is Realist in ontology and epistemology, externalist in semantics, and computationalist in cognitive psychology, which nicely allows us to retain our understanding of ourselves as rational creatures. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) |
2435 | Psychology has to include the idea that mental processes are typically truth-preserving [Fodor] |
Full Idea: A psychology that can't make sense of such facts as that mental processes are typically truth-preserving is ipso facto dead in the water. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §1.3) |
2442 | Inferences are surely part of the causal structure of the world [Fodor] |
Full Idea: Inferences are surely part of the causal structure of the world. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §3) |
10751 | Second-order logic needs the sets, and its consequence has epistemological problems [Rossberg] |
Full Idea: Second-order logic raises doubts because of its ontological commitment to the set-theoretic hierarchy, and the allegedly problematic epistemic status of the second-order consequence relation. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §1) | |
A reaction: The 'epistemic' problem is whether you can know the truths, given that the logic is incomplete, and so they cannot all be proved. Rossberg defends second-order logic against the second problem. A third problem is that it may be mathematics. |
10757 | Henkin semantics has a second domain of predicates and relations (in upper case) [Rossberg] |
Full Idea: Henkin semantics (for second-order logic) specifies a second domain of predicates and relations for the upper case constants and variables. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §3) | |
A reaction: This second domain is restricted to predicates and relations which are actually instantiated in the model. Second-order logic is complete with this semantics. Cf. Idea 10756. |
10759 | There are at least seven possible systems of semantics for second-order logic [Rossberg] |
Full Idea: In addition to standard and Henkin semantics for second-order logic, one might also employ substitutional or game-theoretical or topological semantics, or Boolos's plural interpretation, or even a semantics inspired by Lesniewski. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §3) | |
A reaction: This is helpful in seeing the full picture of what is going on in these logical systems. |
10753 | Logical consequence is intuitively semantic, and captured by model theory [Rossberg] |
Full Idea: Logical consequence is intuitively taken to be a semantic notion, ...and it is therefore the formal semantics, i.e. the model theory, that captures logical consequence. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §2) | |
A reaction: If you come at the issue from normal speech, this seems right, but if you start thinking about the necessity of logical consequence, that formal rules and proof-theory seem to be the foundation. |
10752 | Γ |- S says S can be deduced from Γ; Γ |= S says a good model for Γ makes S true [Rossberg] |
Full Idea: Deductive consequence, written Γ|-S, is loosely read as 'the sentence S can be deduced from the sentences Γ', and semantic consequence Γ|=S says 'all models that make Γ true make S true as well'. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §2) | |
A reaction: We might read |= as 'true in the same model as'. What is the relation, though, between the LHS and the RHS? They seem to be mutually related to some model, but not directly to one another. |
10754 | In proof-theory, logical form is shown by the logical constants [Rossberg] |
Full Idea: A proof-theorist could insist that the logical form of a sentence is exhibited by the logical constants that it contains. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §2) | |
A reaction: You have to first get to the formal logical constants, rather than the natural language ones. E.g. what is the truth table for 'but'? There is also the matter of the quantifiers and the domain, and distinguishing real objects and predicates from bogus. |
10756 | A model is a domain, and an interpretation assigning objects, predicates, relations etc. [Rossberg] |
Full Idea: A standard model is a set of objects called the 'domain', and an interpretation function, assigning objects in the domain to names, subsets to predicate letters, subsets of the Cartesian product of the domain with itself to binary relation symbols etc. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §3) | |
A reaction: The model actually specifies which objects have which predicates, and which objects are in which relations. Tarski's account of truth in terms of 'satisfaction' seems to be just a description of those pre-decided facts. |
10758 | If models of a mathematical theory are all isomorphic, it is 'categorical', with essentially one model [Rossberg] |
Full Idea: A mathematical theory is 'categorical' if, and only if, all of its models are isomorphic. Such a theory then essentially has just one model, the standard one. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §3) | |
A reaction: So the term 'categorical' is gradually replacing the much-used phrase 'up to isomorphism'. |
10761 | Completeness can always be achieved by cunning model-design [Rossberg] |
Full Idea: All that should be required to get a semantics relative to which a given deductive system is complete is a sufficiently cunning model-theorist. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §5) |
10755 | A deductive system is only incomplete with respect to a formal semantics [Rossberg] |
Full Idea: No deductive system is semantically incomplete in and of itself; rather a deductive system is incomplete with respect to a specified formal semantics. | |
From: Marcus Rossberg (First-order Logic, 2nd-order, Completeness [2004], §3) | |
A reaction: This important point indicates that a system might be complete with one semantics and incomplete with another. E.g. second-order logic can be made complete by employing a 'Henkin semantics'. |
2462 | Control of belief is possible if you know truth conditions and what causes beliefs [Fodor] |
Full Idea: Premeditated cognitive management is possible if knowing the contents of one's thoughts would tell you what would make them true and what would cause you to have them. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: I love the idea of 'cognitive management'. Since belief is fairly involuntary, I subject myself to the newspapers, books, TV and conversation which will create the style of beliefs to which I aspire. Why? |
2460 | Participation in an experiment requires agreement about what the outcome will mean [Fodor] |
Full Idea: To be in the audience for an experiment you have to believe what the experimenter believes about what the outcome would mean, but not necessarily what the outcome will be. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) |
2461 | An experiment is a deliberate version of what informal thinking does all the time [Fodor] |
Full Idea: Experimentation is an occasional and more or less self-conscious exercise in what informal thinking does all the time without thinking about it. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) |
2454 | We can deliberately cause ourselves to have true thoughts - hence the value of experiments [Fodor] |
Full Idea: A creature that knows what makes its thoughts true and what would cause it to have them, could therefore cause itself to have true thoughts. …This would explain why experimentation is so close to the heart of our cognitive style. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) |
2455 | Interrogation and experiment submit us to having beliefs caused [Fodor] |
Full Idea: You can put yourself into a situation where you may be caused to believe that P. Putting a question to someone who is in the know is one species of this behaviour, and putting a question to Nature (an experiment) is another. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) |
2458 | Theories are links in the causal chain between the environment and our beliefs [Fodor] |
Full Idea: Theories function as links in the causal chains that run from environmental outcomes to the beliefs that they cause the inquirer to have. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) |
2443 | I say psychology is intentional, semantics is informational, and thinking is computation [Fodor] |
Full Idea: I hold that psychological laws are intentional, that semantics is purely informational, and that thinking is computation (and that it is possible to hold all of these assumptions at once). | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: When he puts it baldly like that, it doesn't sound terribly persuasive. Thinking is 'computation'? Raw experience is irrelevant? What is it 'like' to spot an interesting connection between two propositions or concepts? It's not like adding 7 and 5. |
2453 | We are probably the only creatures that can think about our own thoughts [Fodor] |
Full Idea: I think it is likely that we are the only creatures that can think about the contents of our thoughts. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: I think this is a major idea. If you ask me the traditional question - what is the essential difference between us and other animals? - this is my answer (not language, or reason). We are the metathinkers. |
2446 | Cartesians consider interaction to be a miracle [Fodor] |
Full Idea: The Cartesian view is that the interaction problem does arise, but is unsolvable because interaction is miraculous. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: A rather unsympathetic statement of the position. Cartesians might think that God could explain to us how interaction works. Cartesians are not mysterians, I think, but they see no sign of any theory of interaction. |
2445 | Semantics v syntax is the interaction problem all over again [Fodor] |
Full Idea: The question how mental representations could be both semantic, like propositions, and causal, like rocks, trees, and neural firings, is arguably just the interaction problem all over again. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: Interesting way of presenting the problem. If you seem to be confronting the interaction problem, you have probably drifted into a bogus dualist way of thinking. Retreat, and reformulate you questions and conceptual apparatus, till the question vanishes. |
2464 | Type physicalism equates mental kinds with physical kinds [Fodor] |
Full Idea: Type physicalism is, roughly, the doctrine that psychological kinds are identical to neurological kinds. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], App A n.1) | |
A reaction: This gets my general support, leaving open the nature of 'kinds'. Presumably the identity is strict, as in 'Hesperus is identical to Phosphorus'. It seems unlikely that if you and I think the 'same' thought, that we have strictly identical brain states. |
2447 | Hume has no theory of the co-ordination of the mind [Fodor] |
Full Idea: What Hume didn't see was that the causal and representational properties of mental symbols have somehow to be coordinated if the coherence of mental life is to be accounted for. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: Certainly the idea that it all somehow becomes magic at the point where the brain represents the world is incoherent - but it is a bit magical. How can the whole of my garden be in my brain? Weird. |
2440 | Propositional attitudes are propositions presented in a certain way [Fodor] |
Full Idea: Propositional attitudes are really three-place relations, between a creature, a proposition, and a mode of presentation (which are sentences of Mentalese). | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §2.II) | |
A reaction: I'm not sure about 'really'! Why do we need a creature? Isn't 'hoping it will rain' a propositional attitude which some creature may or may not have? Fodor wants it to be physical, but it's abstract? |
2450 | Rationality has mental properties - autonomy, productivity, experiment [Fodor] |
Full Idea: Mentalism isn't gratuitous; you need it to explain rationality. Mental causation buys you behaviours that are unlike reflexes in at least three ways: they're autonomous, they're productive, and they're experimental. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: He makes his three ways sound all-or-nothing, which is (I believe) the single biggest danger when thinking about the mind. "Either you are conscious, or you are not..." |
2437 | XYZ (Twin Earth 'water') is an impossibility [Fodor] |
Full Idea: There isn't any XYZ, and there couldn't be any, and so we don't have to worry about it. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §2.I) | |
A reaction: Jadeite and Nephrite are real enough, which are virtually indistinguishable variants of jade. You just need Twin Jewellers instead of Twin Earths. We could build them, and employ twins to work there. |
2441 | Truth conditions require a broad concept of content [Fodor] |
Full Idea: We need the idea of broad content to make sense of the fact that thoughts have the truth-conditions that they do. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §2.II) | |
A reaction: There seems to be (as Dummett points out) a potential circularity here, as you can hardly know the truth-conditions of something if you don't already know its content. |
3114 | Concepts aren't linked to stuff; they are what is caused by stuff [Fodor] |
Full Idea: If the words of 'Swamp Man' (spontaneously created, with concepts) are about XYZ on Twin Earth, it is not because he's causally connected to the stuff, but because XYZ would cause his 'water' tokens (in the absence of H2O). | |
From: Jerry A. Fodor (The Elm and the Expert [1993], App B) | |
A reaction: The sight of the Eiffel tower causes my 'France' tokens, so is my word "France" about the Eiffel Tower? What would cause my 'nothing' tokens? |
2452 | Knowing the cause of a thought is almost knowing its content [Fodor] |
Full Idea: If you know the content of a thought, you know quite a lot about what would cause you to have it. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: I'm not sure where this fits into the great jigsaw of the mind, but it strikes me as an acute and important observation. The truth of a thought is not essential to make you have it. Ask Othello. |
2432 | Is content basically information, fixed externally? [Fodor] |
Full Idea: I assume intentional content reduces (in some way) to information. …The content of a thought depends on its external relations; on the way that the thought is related to the world, not the way that it is related to other thoughts. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §1.2) | |
A reaction: Does this make Fodor a 'weak' functionalist? The 'strong' version would say a thought is merely a location in a flow diagram, but Fodor's 'mentalism' includes a further 'content' in each diagram box. |
2438 | In the information view, concepts are potentials for making distinctions [Fodor] |
Full Idea: Semantics, according to the informational view, is mostly about counterfactuals; what counts for the identity of my concepts is not what I do distinguish but what I could distinguish if I cared to (even using instruments and experts). | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §2.I) | |
A reaction: We all differ in our discriminations (and awareness of expertise), so our concepts would differ, which is bad news for communication (see Idea 223). The view has some plausibility, though. |
2439 | Semantic externalism says the concept 'elm' needs no further beliefs or inferences [Fodor] |
Full Idea: It is the essence of semantic externalism that there is nothing that you have to believe, there are no inferences that you have to accept, to have the concept 'elm'. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §2.I) | |
A reaction: [REMINDER: broad content is filed in 18.C.7, under 'Thought' rather than under language. That is because I am a philospher of thought, rather than of language. |
2457 | If meaning is information, that establishes the causal link between the state of the world and our beliefs [Fodor] |
Full Idea: It is the causal connection between the state of the world and the contents of beliefs that the reduction of meaning to information is designed to insure. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: I'm not clear why characterising the contents of a belief in terms of its information has to amount to a 'reduction'. A cup of tea isn't reduced to tea. Connections imply duality. |
2451 | To know the content of a thought is to know what would make it true [Fodor] |
Full Idea: If you know the content of a thought, you thereby know what would make the thought true. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: The truthmaker might by physically impossible, and careful thought might show it to be contradictory - but that wouldn't destroy the meaning. |
2433 | For holists no two thoughts are ever quite the same, which destroys faith in meaning [Fodor] |
Full Idea: If what you are thinking depends on all of what you believe, then nobody ever thinks the same thing twice. …That is why so many semantic holists (Quine, Putnam, Rorty, Churchland, probably Wittgenstein) end up being semantic eliminativists. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §1.2b) | |
A reaction: If linguistic holism is nonsense, this is easily settled. What I say about breakfast is not changed by reading some Gibbon yesterday. |
2436 | It is claimed that reference doesn't fix sense (Jocasta), and sense doesn't fix reference (Twin Earth) [Fodor] |
Full Idea: The standard view is that Frege cases [knowing Jocasta but not mother] show that reference doesn't determine sense, and Twin cases [knowing water but not H2O] show that sense doesn't determine reference. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §1.3) | |
A reaction: How about 'references don't contain much information', and 'descriptions may not fix what they are referring to'? Simple really. |
2434 | Broad semantics holds that the basic semantic properties are truth and denotation [Fodor] |
Full Idea: Broad semantic theories generally hold that the basic semantic properties of thoughts are truth and denotation. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §1.2b) | |
A reaction: I think truth and denotation are the basic semantic properties, but I am dubious about whole-hearted broad semantic theories, so I seem to have gone horribly wrong somewhere. |
2459 | Externalist semantics are necessary to connect the contents of beliefs with how the world is [Fodor] |
Full Idea: You need an externalist semantics to explain why the contents of beliefs should have anything to do with how the world is. | |
From: Jerry A. Fodor (The Elm and the Expert [1993], §4) | |
A reaction: Since externalist semantics only emerged in the 1970s, that implies that no previous theory had any notion that language had some connection to how the world is. Eh? |
16707 | Cold and hot are the swiftness and slowness of corpuscular motion [Beeckman] |
Full Idea: There is no doubt that the nature of cold and hot are taken from the swiftness and slowness of the motion of corpuscules. | |
From: Isaac Beeckman (Journals [1617], I:132), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 19.6 | |
A reaction: This is so right it takes your breath away. For 'corpuscles' we should normally read 'molecules'. Atomism is a further refinement. This is the rejection of the orthodox view of separate qualities. |