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Words & Meaning: An introduction. Words & Meaning Words and meanings are linked, but they are not identical Your textbook gives three reasons why: –i.)

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Presentation on theme: "Words & Meaning: An introduction. Words & Meaning Words and meanings are linked, but they are not identical Your textbook gives three reasons why: –i.)"— Presentation transcript:

1 Words & Meaning: An introduction

2 Words & Meaning Words and meanings are linked, but they are not identical Your textbook gives three reasons why: –i.) The translation argument –ii.) The imperfect mapping argument –iii.) The elasticity argument –iv.) The partial ignorance argument

3 Overview Intro to words and meanings Three classic theories of meaning What is meaning made of? –3 Feature theories: Classical, Family Resemblance, Protype –Can we have meaning without features?

4 The translation argument Many words that exist in other languages that do not have an equivalent word in English- –i.e. 'schlep', to move a heavy and bulky item from one place to another. Since we have the meaning, but not the word, in English, a word cannot be identical to its meaning- we can get one without the other

5 The imperfect mapping argument If words were the same as meanings, then there would be one word for every meaning, and one meaning for every word. Of course, there is not: some strings of letters or phonemes have multiple meanings (ambiguity), and some meanings have many words (synonymy).

6 The elasticity argument The meaning of a word is not a fixed thing but varies with its context of use. –So 'a tall tale' is not the same thing as 'a tall man'. Since the meaning of a word is not simply a function of the word, it cannot be that a word and its meaning are identical.

7 The partial ignorance argument Many of us (especially scrabble players) can recognize words that we can't give the meanings of –Don’t we want to say that in that case the person ‘knows the word’, but not the meaning? –And if we do, doesn’t that mean that a word is something other than its meaning?

8 What is a word? Similar arguments apply to a word’s sound or visual representation –Many of us know words that we cannot pronounce, or words that we cannot spell –We may even know that a word exists for a meaning, but know neither its spelling or sound –A word cannot be simply identified with any one of these aspects, although most words participate in all three aspects

9 Open and closed class words We want to make a very sharp distinction between two kinds of words –Open class words: Words that pick out a thing or an action or an abstract pattern (like 'peace' or 'justice') –Closed class words: Words that serve a purpose in mediating between other words Closed class words are function words like articles '('the', 'a'), conjunctions ('and', 'or', 'because'), prepositions ('on', 'under') etc. that serve to define the relationships between words or between their referents –Closed class words serve a vital role: to lose them (as in Broca's aphasia) is largely to lose the ability to communicate

10 Complications What about words like ‘hey’, ‘um’, or ‘so’? –They don’t ‘mean’ anything (they have ‘bleached semantics’) but they are still useful for certain kinds of purposes. What about private invented words that have never been shared with anyone else? Should they count as words?

11 Intension/Extension We refer to a phrase's definition as its intension: so the intension of a word like ‘chair’ might be ‘furniture specifically designed for sitting on’ we contrast this to the phrase’s extension: the objects that fall under the intension- in this case, all chairs. These have to be kept separate for many reasons, most notably because knowledge of a phrase’s intension does not necessarily make its own extension obvious –e.g. ‘The people I ate dinner with last night’ Much philosophy of meaning hangs on this distinction

12 Three ‘classic’ theories of meaning i.) Meaning as reference - Two problems ii.) Meaning as ideational iii.) Meaning as conventionality

13 i.) Meaning as reference Early philosophy of language tried to build a definition of meaning from saying that the meaning of a word was identical to the subset of its intension to which it referred- so if I say 'the chair you are sitting on' what I mean is the chair right there. This approach came from mathematics and logic Gottlob Frege’s predicate calculus is a form of logic that analyzes propositions into atomic and quantified statements –These propositions, along with related axioms, formed a kind of calculus that related mathematics and logic (alas, unsuccessfully as Russell showed). Logical atomism: Each symbol (word) had to ‘stand for’ an object

14 Problems There were many famous philosophical problems with this: a.) The difficulty of fixing the referent of a word b.) Some words have no apparent referent

15 a.) Fixing the referent of a word Consider ‘the celestial body which is visible low on the horizon in the early hours of the morning’ One can perfectly understand and use this definition without understanding that its referent is identical to the referent of the word ‘Venus’- because Venus is in fact the morning star. –You might even believe it was true that ‘The morning star is not the planet Venus’ even though you know the reference of each term individually- and therefore of both terms Similarly many examples of a word's referent does not always allow us to fix meaning of the word, due to the failure of induction –Quine's ‘gavagai’

16 b.) Some words have no apparent referent Closed-class words or very abstract words or words which refer to non-existent entities Alexius Meinong: Since meaningful things must refer, non-existent objects must ‘exist’ in logical space Bertrand Russell: ‘Logic must no more admit a unicorn than zoology can.’

17 Theory of descriptions Descriptions are not names, but logical syllogisms A logical syllogism can be sensible (well-defined) but false –Thereby we can salvage expressions that refer to non- existent entities without having to postulate their existence –In this view language obscures what is actual the case –Later we shall see that Wittgenstein will have much to say about this, in two different but related ways

18 ii.) Meaning as ideational Perhaps word Venus does not refer to the celestial body itself, but to your own idea of the planet. There are two problems: –i.) If words refers to something in your head, then we have to say that the referent of a word must share the same properties as things in your head The word 'light' refers to something in your head, so it must be true that 'the word light refers to something that it is dark'- which is mad. –ii.) Failure to keep public reference If you are talking about something inside you and I am talking about something inside me, then how do we ever agree on what we mean? Meaning must be fixed publicly in some way.

19 ii.) Meaning as conventional Perhaps meaning is a public construction –we keep reference public by the way we act- we debug our internal references by our actions –If you have one view of what I mean by 'Venus' and I have another, then we will fix them when our behaviours collide in some way. –One implication is that we can mean different things by words so long as our meaning doesn't have any practical effects that keep us out of synchrony with someone else with whom we cannot be de- synchronized

20 What is meaning made of? However meaning may be fixed, we still want to know what it is that is fixed. What is meaning made of? How it is organized?

21 Feature theories One common answer is that meaning is made of features (or dimensions) –So a cat has features like 'is an animal', 'is a mammal', 'can be domesticated’ –This is popular in AI, since it gives meaning a clear tree structure allowing for inheritance –For example, if you know that a cat is a mammal, then you automatically know that it bears it young live, it suckles its young, it has fur etc. etc.

22 How do features combine? The 'classical view' says that a concept is defined by necessary and sufficient features- i.e. by some features that it must have (the necessary ones), and by a minimal set of features that are all it needs (the sufficient ones). This is a cold logical view, which assumes that there is a discernible, specifiable logic underlying not just 'hard' concepts like 'triangle', but soft ones like love, peace, and justice too.

23 How do features combine? The 'family resemblance' view says that there is no necessary or jointly sufficient features, but there is a greater or lesser agreement of a concept with its set of possible features –This allows us to say that an individual can be a more or less good exemplar of a concept- so, a robin is a better example of a bird (because it has more 'bird' features) than a penguin. –It also allows us to allow things to degrade without changing category membership- so a canary is almost always yellow, but it doesn't have to cease being a canary if we paint it purple

24 Prototypes The best exemplar is a prototype Evidence shows that it has some psychological reality: people will respond faster to the sentence 'a robin is a bird' than they will to 'a penguin is a bird'. There is evidence that even categories which are defined classically, with necessary and sufficient conditions, show family resemblance structure –People systematically judge some numbers as being 'more odd' than others (and respond faster to statements about them), even though the only requirement for oddness is not being divisible by 2. –Same for 'a mother is a woman' (faster) than 'waitress is a woman' (slower)

25 How do features combine? The ‘knowledge-based’ view is an extension of feature theories One problem with features is knowing where the end: when do features stop having features so that the system can 'bottom out' and return an answer. –In some cases this is obvious (i.e. when the search is on for a specific feature), but in others it is not How do we calculate when we have 'enough' features to make a judgment such as 'A penguin is a bird'. How do we build idiosyncratic feature sets like ‘Things my grandmother never lived to see that I own’?

26 How do features combine? Knowledge based approaches say that features are built in contexts of 'theories'- that concepts cohere based on a deeper coherence of explanations which those features together –Of course, this opens up the same questions we are trying to answer, but at a different level: what is a theory made up? What are its components?

27 Psychological essentialism One theory is ‘Psychological essentialism’: people act as if things have essences that could be defined, and sometimes they know what those essences are –So, we have a theory that says that water is made of 2 hydrogen atoms and 1 oxygen atom, and anything else- no matter how much it looks or acts like water- is not water. –most of us accept this: contra family resemblance theory, some features just are necessary

28 Psychological contextualism ’Psychological contexualism' says that theories of essentialism can change with context –Some features just are necessary in some contexts –We might accept artificial orange juice as orange juice if we were thirsty, but might want to argue in chemistry or philosophy class that a liquid containing no matter from oranges was not orange juice.

29 Meaning without features? Features are defined generally enough to be all-inclusive: any difference may be defined as a feature Later we will see other approaches that define features in unexpected ways: as vectors in co-occurrence space, or as undefinable variety [i.e. maybe features have no features!]

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