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The Idea Theory of Meaning

The Idea Theory of Meaning

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The Idea Theory of Meaning

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  1. The Idea Theory of Meaning

  2. Outline • Metasemantics • The Conformal Theory • The Idea Theory • Problems for the Idea Theory • Summary

  3. 1. metasemantics

  4. The Meaningless World Most things in the world don’t have meanings. Rivers and lakes and trees and rocks and planets and black holes and electrons… none of these things have meanings. There’s nothing that a river is about, there is nothing that a lake represents, a tree can’t be true or false.

  5. Meaningful Artifacts A very small number of things, however, do have meanings/ are about or represent other things. Many of these meaningful things are human artifacts, like maps, diagrams, paintings, icons, etc. In addition, there are linguistic and mental representations.

  6. Language All normal human beings, and most abnormal human beings, speak a language. First languages don’t need to be taught; they come naturally to us. A sentence like “The cat is on the mat” has a meaning; it is about a certain cat and a certain mat; and it is true if the cat it’s about is on the mat it’s about, and false otherwise.

  7. Mental Representation Thoughts too are representational. I can think about cats, and I can think that a cat is on a mat. Unlike language, it’s plausible that a large number of non-human animals have representational thoughts. Almost certainly dolphins and dogs, and maybe even bees and ants.

  8. Metasemantics Since most things aren’t meaningful, and only a few things are, it’s reasonable to ask: why do things like maps, sentences, and thoughts have meanings and rivers, lakes, and trees have no meanings? And why, for example, is a map of Hong Kong a map of Hong Kong, rather than (say) a map of Kuala Lumpur? Why do meaningful things have the meanings they do rather than some other meaning?

  9. Metasemantics “Metasemantics” (metaphysical semantics, the metaphysics of meanings) is the part of philosophy of language that tries to answer the question: “Why [in virtue of what] do meaningful things have the meanings they do, rather than some other meaning, or no meaning at all?”

  10. Original vs. Derived Intentionality A historically popular strategy for approaching this question has been to draw a distinction between original and derived intentionality (representation).

  11. Original vs. Derived Intentionality Minds (more accurately: thoughts) have original intentionality. We have to have a real story for them to answer the metasemantic question (why they mean what they do). Other non-mental representations on the other hand, like diagrams and sentences, have derived intentionality. They mean what they do because they inherit their meanings from our thoughts.

  12. 2. The conformal theory

  13. Aristotle on Hylomorphism According to Aristotle, substances are composed of matter + form. Example: a house is a substance. The matter of the house is the bricks, cement, plaster, wood, and so forth. But the house is not just the bricks and cement, etc. It is those bricks, cement, plaster, etc. arranged in a certain way: with a certain form.

  14. The Conformal Theory of Representation Aristotle held an obscure doctrine of the identity of the knower with the known. The basic idea seems to be this. When I think of a house, for instance, my soul (i.e. my matter) takes on the form of a house. Thus, even though I (me, my soul, my matter) am distinct from a house (its matter), I represent the house because it and my soul have literally the same form (the form of a house).

  15. Aristotle on Linguistic Representation Furthermore, Aristotle thought that spoken language was an outward sign of the state of one’s soul. So the (spoken) word ‘horse’ was a sign of my soul having the form of a horse. So we can say that ‘horse’ represents horses, because it is a sign of a state of my soul that represents horses (by identity of form with them).

  16. Problem for the Conformal Theory Aristotle’s greatest medieval follower, St. Thomas Aquinas, tried to deal with a problem in the conformal theory. I represent a rock by having the same form as a rock. So why doesn’t the rock represent me, since it and I have the same form, and representation = sameness of form?

  17. Intentional Presence The solution was that the rock-form was not “really” present in me, it was only “spiritually” present. Spiritually present forms represent really present ones, but not vice versa. (Incidentally, this is also the explanation for why even though I have the form of a rock, I don’t look anything like a rock.)

  18. The New Science The 17th Century saw the rise of corpuscularianism. It was a lot like Greek atomism, except whereas atoms are essentially indivisible, corpuscles could theoretically be divided. Notable corpuscularians were Robert Boyle, Isaac Netwon, Thomas Hobbes, and John Locke.

  19. Corpuscularianism The view was that everything is made out of corpuscles– microscopic little bits that had a certain shape, size, and momentum. However, the corpuscles did not have color, taste, smell, sound, or warmth. These other qualities were explained as the effects of the corpuscles on our sensory organs. For example, heat is just the motion of corpuscles, but this motion causes us to experience the sensation of warmth.

  20. The Unreality of Tastes, Colors, etc. “I think that tastes, odors, colors, and so on are no more than mere names so far as the object in which we place them is concerned, and that they reside only in the consciousness. Hence if the living creature were removed, all these qualities would be wiped away and annihilated” (Galileo, The Assayer).

  21. Problems for the Conformal Theory But if colors, for example, exist only in the mind, then it cannot be true that when I represent a white horse, my soul has the same form as a white horse. There are no white horses. There are horses that cause me to experience whiteness when light bounces off of them. But the whiteness itself depends on me, the observer. Whiteness exists only in minds.

  22. 3. The idea theory

  23. The Idea Theory The new scientific developments called for a new theory of representation. Many philosophers, including Descartes, Hobbes, and Locke adopted an “idea theory” to account for representation.

  24. Locke on The Idea Theory “Words are sensible signs, necessary for communication of ideas. Man, though he have great variety of thoughts, and such from which others as well as himself might receive profit and delight; yet they are all within his own breast, invisible and hidden from others, nor can of themselves be made to appear. The comfort and advantage of society not being to be had without communication of thoughts, it was necessary that man should find out some external sensible signs, whereof those invisible ideas, which his thoughts are made up of, might be made known to others.”

  25. Comparison with the Conformal Theory For Aristotle and Aquinas, a mind/ soul represents an object by sharing its form. Language represents by indicating the state of the soul. The idea theory introduces a new element. The mind represents a thing by having an idea that represents that thing. A word represents by indicating an idea present in the mind.

  26. The Nature of Ideas What are these ideas then? According to Locke, ideas are “the pictures drawn in our minds” (Essay, II.x.5). An idea of a horse, then, is very much like a picture, image, or painting of a horse. Compare Hume: “By ideas I mean the faint images of [perceptions] in thinking and reasoning” (Treatise, I.i.1).

  27. Resemblance Theory of Representation Importantly, ideas don’t represent by sharing forms with their intentional objects (as we’ve seen, science doesn’t allow this). Instead, just like paintings, ideas represent by resembling their intentional objects. An idea of a horse is like a picture of a horse, and it represents a horse as a picture does: by resembling it.

  28. Resemblance Theory The resemblance theory is really the important part of the idea theory, because it does all the explaining. Why does word W mean X? Because W is associated with idea I and I means X. But why does I mean X? Because I resembles X.

  29. CorpuscularianismRedux The idea theory can’t exactly escape the problem the conformal theory faced. A painting of a red wall resembles a red wall in the sense that if you looked at both, the appearances they generate in you would be the same, because both share a feature– they reflect light at a wavelength between 630 and 700nm. But surely (a) you don’t look at your mental states and (b) your mental states don’t reflect light!

  30. Primary vs. Secondary Qualities Locke famously draws a distinction between primary and secondary qualities, where the primary qualities of an object are those ascribed to it by corpuscularianism (shape, size, momentum, and what Locke calls ‘solidity’), and the secondary qualities are propensities of the object to cause certain appearances in us (like the feeling of warmth).

  31. Primary vs. Secondary Qualities Locke thought that ideas of primary qualities really did resemble those primary qualities, but the resemblance theory was false for secondary qualities. Ideas of primary qualities represent by resembling; ideas of secondary qualities represent in some other way. (Locke identified this way as causal– an idea of a secondary quality represents the idea that quality has a propensity to cause. This doesn’t work.)

  32. Only Ideas Can Resemble Ideas Berkeley, however, argued that no idea resembled anything physical or material; ideas only resembled ideas. Ideas aren’t spatial and thus they don’t have shapes, sizes or momenta. Is your idea of a big elephant bigger than your idea of a small elephant? Ideas don’t even resemble the primary qualities, like shape, size, and momentum.

  33. Idealism For Berkeley, this wasn’t a bad thing, and it didn’t show that the idea theory or the resemblance theory were false. What it showed, instead, was that our thoughts were not about a physical world, but of a world made of ideas. My idea of a table was an idea of an idea, because tables are ideas. (This is how we are able to represent them, because ideas can resemble other ideas.)

  34. Locke on General Terms “It is not enough for the perfection of language, that sounds can be made signs of ideas, unless those signs can be so made use of as to comprehend several particular things: for the multiplication of words would have perplexed their use, had every particular thing need of a distinct name to be signified by. To remedy this inconvenience, language had yet a further improvement in the use of general terms, whereby one word was made to mark a multitude of particular existences.”

  35. Abstract Ideas Locke’s picture here is that there are terms for particular things (names) and terms that don’t apply to any one particular thing, but apply equally to groups of things (terms like ‘dog’ or ‘house’– these aren’t names of a particular dog or a particular house). If we accept the idea theory, then, we have to accept that there are “abstract ideas”– not mental pictures of a particular person, but mental pictures that resemble equally a group of things.

  36. Berkeley vs. Abstract Ideas Berkeley, however, argues that abstract ideas are impossible. The abstract idea of a man is supposed to apply equally to a tall man and a short man; a black man and a white man; a skinny man and a fat man; well-dressed man and a pauper, etc. But no picture resembles equally all such men, as any picture of a man depicts him as either skinny or fat, but not both and not neither.

  37. Berkeley Again, this didn’t lead Berkeley to reject the idea theory, only to (once again) place a severe limit on what we can have ideas of. Just as we can’t have ideas of non-ideas (because non-ideas can’t resemble ideas) we can’t have ideas of abstract things, because mental pictures are always determinate and never abstract (like regular pictures).

  38. Hume: Impressions and Ideas David Hume took Berkeley’s style of austere empiricism to its logical extreme. Hume makes a distinction that wasn’t made by Locke and Berkeley between impressions and ideas. Impressions are sensations or perceptions or sense experiences. Things like seeing red or feeling pain. The idea of red is not the same thing as seeing red though: for Hume, all (simple) ideas are “copies” of impressions.

  39. The Tribunal of Experience Hume then proposes the tribunal of experience. For each supposed idea, we ask: • Is it copied from an impression? If so, which one? [No answer? Go to (d).] • If not, is it a complex idea, built out of simpler ones? • If so, repeat (a) and (b) for each of its parts. • If not, it’s not really an idea at all!

  40. Hume vs. Causation Hume notoriously targeted causation for the tribunal of experience. Imagine the following sequence of events (that is, have the following sequence of ideas in your head): first you have an idea of ball A headed toward ball B. Then A hits B and causes B to move away. Got it? OK, now imagine this other sequence of events: A is moving toward B, A and B touch, and B moves away on its own (not because A caused it).

  41. Hume vs. Causation What’s the difference here? Hume argued that there wasn’t one. You couldn’t see one event causing another, and since all ideas were copies of impressions (for Hume), you couldn’t have an idea of one event causing another.

  42. Other Imperceptibles There were some other problems with the idea theory involving unobservables. How is your idea of a black hole or an electron anything like those things? Even more straightforwardly, how is your idea of (for example) Moses anything like Moses (there’s no ancient statues or other representations of him)? But it seems we do have an idea of Moses, at least in the sense that we can think about him.

  43. 4. Problems for the idea theory

  44. Concepts vs. Propositions We can draw a distinction between concepts and propositions. Concepts are representations of things or qualities: so I can have a concept of Obama, or a concept of red, or a concept of a horse, or a concept of a concept. Importantly, concepts are not truth-evaluable. My concept of red isn’t true, and it isn’t false either. It might be more or less accurate.

  45. Propositions We can say that when I think of a thing, or think about a thing, then I am entertaining a concept. However, when I think that such-and-such, I am entertaining a proposition. For example, I can think that Obama is the US president, or think that grass is red, or think that the concept of a horse is not a concept. Propositions are truth-evaluable: when I think that grass is red, my thought is false. (Not so when I just think of red.)

  46. The idea theory seems to have trouble distinguishing concepts and propositions. According to the idea theory, thought is having ideas, and ideas are like mental pictures. Are mental pictures truth-evaluable? If they are, then concepts aren’t ideas. If they aren’t, then

  47. Resemblance as an Equivalence Relation Resemblance, like identity, is an equivalence relation, meaning it’s reflexive, symmetric, and transitive: Reflexive: for all X, X resembles X. (Everything resembles itself.) Symmetric: for all X and Y, if X resembles Y, then Y resembles X. Transitive: for all X, Y, and Z, if X resembles Y and Y resembles Z, then X resembles Z.

  48. Representation is Not Reflexive Unfortunately, representation is not an identity relation: It’s not reflexive: you can have a representation that represents itself (for example, a map of Hong Kong that includes the map’s location), but most representations don’t represent themselves. You can have a painting of a horse, that is not a painting of a painting of a horse (not a painting of itself).

  49. Representation is Not Symmetric Representation is typically not symmetric, as most of what gets represented is not representational. My thoughts represent lakes and rivers and trees, but lakes and rivers and trees don’t represent my thoughts (because they don’t represent anything). And even when I do represent representations (when I think about a painting, say), usually they don’t represent me or my thoughts (most painters have never even heard of me).

  50. Representation is not Transitive Finally, representation isn’t transitive. The directory at the museum might represent the location of a certain Picasso painting. That painting could represent a horse. But the directory doesn’t represent any horses, it only represents paintings.