PSY 369: Psycholinguistics

1. PSY 369: Psycholinguistics Language Comprehension: Semantic networks

2. Language perception Word recognition Syntactic analysis Semantic & pragmatic analysis Input c dog a cat cap S t wolf The cat chased the rat. VP NP tree V NP /k/ yarn cat the chased the rat /ae/ cat claw /t/ fur hat Overview of comprehension

3. Different approaches • Immediacy Principle: access the meaning/syntax of the word and fit it into a syntactic structure • Serial Analysis (Modular): Build just one based on syntactic information and continue to try to add to it as long as this is still possible • Interactive Analysis: Use multiple levels (both syntax and semantics) of information to build the “best” structure

4. S S NP VP NP the spy V NP VP S’ S’ the spy saw NP PP V PP NP the cop P NP saw P NP with the revolver but the cop didn’t see him the cop but the cop didn’t see him with the revolver Minimal attachment • Garden path sentences (Rayner & Frazier, 1983) MA Non-MA The spy saw the cop with the binoculars.. The spy saw the cop with the revolver <- takes longer to read Conclusion: participants didn’t use semantic information initially, built the wrong structure and had to reanalyze. Supports a serial model.

5. Interactive Models • Other factors (e.g., semantic context, co-occurrence of usage & expectation) may provide cues about the likely interpretation of a sentence (e.g. overriding purely syntactic principles like Minimal Attachment) • Trueswell et al (1994). Local semantic feature like Animacy • The evidence (that was) examined by the lawyer … • The defendant(that was) examined by the lawyer… • Taraban & McCelland (1988). Expectation • The couple admired the house with a friendbut knew that it was over-priced. • The couple admired the house with a gardenbut knew that it was over-priced.

6. What about spoken sentences? • All of the previous research focused on reading, what about parsing of speech? • Methodological limits – ear analog of eye-movements not well developed • Auditory moving window • Reading while listening • Looking at a scene while listening

7. Summing up • Is ambiguity resolution a problem in real life? • Yes (Try to think of a sentence that isn’t partially ambiguous) • Many factors might influence the process of making sense of a string of words. (e.g. syntax, semantics, context, intonation, co-occurrence of words, frequency of usage, …)

8. Semantics • Two levels of analysis (and two traditions of psycholinguistic research) • Word level (lexical semantics, chapter 11) • What is meaning? • How do words relate to meaning? • How do we store and organize words? • Sentence level (compositional semantics) (chapter 12) • How do we construct higher order meaning? • How do word meanings and syntax interact?

9. Separation of word and meaning • Words are not the same as meaning • Words are symbols linked to mental representations of meaning (concepts) • Even if we changed the name of a rose, we would not change the concept of what a rose is • Concepts and words are different things • Translation argument – we can translate words between languages (even if not every word meaning is represented by a single word) • Imperfect mapping - Multiple meanings of words • e.g., ball, bank, bear • Elasticity of meaning - Meanings of words can change with context • e.g., newspaper

10. Semantics • Meaning is more than just associations Write down the first word you think of in response to that word. CAT “Dog”, “mouse”, “hat”, “fur”, “meow”, “purr”, “pet”, “curious”, “lion” • You cannot just substitute these words into a sentence frame and have the same meaning. • Frisky is my daughter’s ______. • Sometimes you get a related meaning, other times something very different.

11. In the 90’s Semantics • Referential theory of meaning (Frege, 1892) • Sense (intension) and reference (extension) • “The world’s most famous athlete.” • “The athlete making the most endorsement income.” • 2 distinct senses, 1 reference Now • Over time the senses typically stay the same, while the references may change 2013 Bleacher report

12. Word and their meanings • Semantic Feature Lists • Decomposing words into smaller semantic attributes/primitives • Perhaps there is a set of necessary and sufficient features

13. Word and their meanings • Semantic Feature Lists “John is a bachelor.” • What does bachelor mean? • What if John: • is married? • is divorced? • has lived with the mother of his children for 10 years but they aren’t married? • has lived with his partner Joe for 10 years? • Suggests that there probably is no set of necessary and sufficient features that make up word meaning • (other classic examples “game”“chair”)

14. Meaning as Prototypes • Prototype theory: store feature information with abstract prototype (Eleanor Rosch, 1975) Rate on a scale of 1 to 7 if these are good examples of category: Furniture 1) chair 1) sofa 2) couch 3) table : : 12) desk 13) bed : : 42) TV 54) refrigerator TV couch table bed chair desk refrigerator

15. Meaning as Prototypes • Prototype theory: store feature information with abstract prototype (Eleanor Rosch, 1975) • Prototypes: • Some members of a category are better instances of the category than others (prototypicality effect) • Fruit: apple vs. pomegranate • What makes a prototype? • Possibly an abstraction of exemplars • More central semantic features • What type of dog is a prototypical dog? • What are the features of it? • We are faster at retrieving prototypical of a category than other less prototypical members of the category

16. Meaning as Prototypes • The main criticism of the model • The model fails to provide a rich enough representation of conceptual knowledge • How can we think logically if our concepts are so vague? • Why do we have concepts which incorporate objects which are clearly dissimilar, and exclude others which are apparently similar (e.g. mammals)? • How do our concepts manage to be flexible and adaptive, if they are fixed to the similarity structure of the world? • If each of us represents the prototype differently, how can we identify when we have the same concept, as opposed to two different concepts with the same label?

17. Meaning as Exemplars • Instance theory: each concept is represented as examples of previous experience (e.g., Medin & Schaffer, 1978) • Make comparisons to stored instances • Typically have a probabilistic component • Which instance gets retrieved for comparison dog

18. Meaning as Theories • A development of the prototype idea to include more structure in the prototype (e.g., Carey, 1985; Keil, 1986) • Concepts provide us with the means to understand our world • A lot of this work came out of concepts of natural kinds • They are not just the labels for clusters of similar things • They contain causal/explanatory structure, explaining why things are the way they are • Similar to “scientific theories” • They help us to predict and explain the world

19. Meaning as Networks • Semantic Networks • Words can be represented as an interconnected network of sense relations • Each word is a particular node • Connections among nodes represent semantic relationships

20. has fins has feathers can swim Fish can fly Bird has gills has wings Collins and Quillian (1969) Semantic Features • Representation permits cognitive economy • Reduce redundancy of semantic features has skin Animal Lexical entry can move around breathes IS A IS A • Collins and Quillian Hierarchical Network model • Lexical entries stored in a hierarchy

21. Collins and Quillian (1969) • Testing the model • Semantic verification task • An A is a B True/False • An apple has teeth • Use time on verification tasks to map out the structure of the lexicon.

22. Collins and Quillian (1969) • Testing the model Sentence Verification time Robins eat worms 1310 msecs Robins have feathers 1380 msecs Robins have skin 1470 msecs • Participants do an intersection search has skin Animal can move around breathes has feathers can fly Bird has wings Robin eats worms has a red breast

23. Collins and Quillian (1969) • Testing the model Sentence Verification time Robins eat worms 1310 msecs Robins have feathers 1380 msecs Robins have skin 1470 msecs • Participants do an intersection search has skin Animal can move around breathes Robins eat worms has feathers can fly Bird has wings Robin eats worms has a red breast

24. Collins and Quillian (1969) • Testing the model Sentence Verification time Robins eat worms 1310 msecs Robins have feathers 1380 msecs Robins have skin 1470 msecs • Participants do an intersection search has skin Animal can move around breathes Robins have feathers has feathers can fly Bird has wings Robin eats worms has a red breast

25. Collins and Quillian (1969) • Testing the model Sentence Verification time Robins eat worms 1310 msecs Robins have feathers 1380 msecs Robins have skin 1470 msecs • Participants do an intersection search has skin Animal can move around breathes Robins have feathers has feathers can fly Bird has wings Robin eats worms has a red breast

26. Collins and Quillian (1969) • Testing the model Sentence Verification time Robins eat worms 1310 msecs Robins have feathers 1380 msecs Robins have skin 1470 msecs • Participants do an intersection search has skin Animal can move around breathes Robins have skin has feathers can fly Bird has wings Robin eats worms has a red breast

27. Collins and Quillian (1969) • Testing the model Sentence Verification time Robins eat worms 1310 msecs Robins have feathers 1380 msecs Robins have skin 1470 msecs • Participants do an intersection search has skin Animal can move around breathes Robins have skin has feathers can fly Bird has wings Robin eats worms has a red breast

28. Collins and Quillian (1969) • Problems with the model • Difficulty representing some relationships • How are “truth”, “justice”, and “law” related? • Effect may be due to frequency of association (organization and conjoint frequency confounded) • “A robin breathes” is less frequent than “A robin eats worms” • Assumption that all lexical entries at the same level are equal • The Typicality Effect • A whale is a fish vs. A horse is a fish • Which is a more typical bird? Ostrich or Robin.

29. has long legs Robin eats worms Ostrich is fast can’t fly has a red breast Collins and Quillian (1969) has skin Animal can move around Robin and Ostrich occupy the same relationship with bird. breathes has fins has feathers can swim Fish can fly Bird has gills has wings Verification times: “a robin is a bird” faster than “an ostrich is a bird”

30. Collins and Quillian (1969) • Problems with the model Animal • Smith, Shoben & Rips (1974) showed that there are hierarchies where more distant categories can be faster to categorize than closer ones • A chicken is a bird was slower to verify than • A chicken is an animal has feathers can fly Bird has wings Chicken lays eggs clucks

31. Spreading Activation Models • Collins & Loftus (1975) • Words represented in lexicon as a network of relationships • Organization is a web of interconnected nodes in which connections can represent: • categorical relations • degree of association • typicality street vehicle car bus truck house orange Fire engine fire red blue apple pear tulips roses fruit flowers

32. Spreading Activation Models • Collins & Loftus (1975) • Retrieval of information • Spreading activation • Limited amount of activation to spread • Verification times depend on closeness of two concepts in a network street vehicle car bus truck house orange Fire engine fire red blue apple pear tulips roses fruit flowers

33. Spreading Activation Models • Advantages of Collins and Loftus model • Recognizes diversity of information in a semantic network • Captures complexity of our semantic representation (at least some of it) • Consistent with results from priming studies

34. Spreading Activation Models • More recent spreading activation models • Probably the dominant class of models currently used • Typically have multiple levels of representations

35. Meaning based representations Grammatical based representations Sound based representations Meaning as networks • There may be multiple levels of representation, with different organizations at each level Today’s focus

36. Meaning beyond the word • Not all meaning resides at the level of the individual words. • Conceptual combinations • Sentences • Move to compositional semantics

37. Conceptual combination • How do we combine words and concepts • We can use known concepts to create new ones • Noun-Noun combinations • Modifier noun • Head noun “Skunk squirrel” “Radiator box” “Helicopter flower”

38. Conceptual combination • How do we combine words and concepts • Relational combination • Relation given between head and modifier • “squirrel box” a box that contains a squirrel • Property mapping combination • Property of modifier attributed to head • “skunk squirrel” a squirrel with a white stripe on its back • Hybrid combinations • A cross between the head and modifier • “helicopter flower” a bird that has parts of helicopters and parts of flowers

39. Conceptual combination • How do we combine words and concepts • Instance theory has problems • Modification? (brown apple) • Separate Prototypes? (big wooden spoon) • But sometimes the combination has a prototypical feature that is not typical of either noun individually (pet birds live in cages, but neither pets nor birds do) • Extending salient characteristics? • When nouns are “alignable” (zebra horse) • But non-alignable nouns are combined using a different mechanism (zebra house)