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0 6 Sentence Comprehension and Memory
구본웅 Biointelligence Laboratory School of Computer Science and Engineering Seoul National University

1 (C) 2008, SNU Biointelligence Lab,
Contents Introduction Immediate Processing of Sentences Comprehending Figurative Language Memory for Sentences Review Questions Thought Questions (C) 2008, SNU Biointelligence Lab,

2 (C) 2008, SNU Biointelligence Lab,
Main Points Parsing is the process of assigning elements of surface structure to linguistic categories. Because of limitations in processing resources, we begin to parse sentences as we see or hear each word in a sentence. We use syntactic, semantic, and pragmatic knowledge to comprehend sentences. An ongoing debate is whether we use these forms of knowledge simultaneously or whether we process syntactic information first. Figurative language is that literally means one thing but is taken to mean another. Although we may sometimes use literal meaning as a guide to figurative meaning, we can also comprehend figurative language directly. We ordinarily remember the gist of a sentence and quickly forget its surface form. An exception is pragmatically significant statements, such as insults, whose exact wording is often well remembered. (C) 2008, SNU Biointelligence Lab,

3 (C) 2008, SNU Biointelligence Lab,
Introduction Comprehending a sentence involves attention to syntactic, semantic and pragmatic factors. What part does each factor play? Do we use our syntactic semantic, and pragmatic knowledge simultaneously when we comprehend a sentence? Or do certain factors take priority at various states of the comprehension process? What kinds of cognitive processes are involved when a sentence, unlike this simple declarative one, is complex enough to be a burden for working memory? (C) 2008, SNU Biointelligence Lab,

4 Immediate Processing of Sentences

5 (C) 2008, SNU Biointelligence Lab,
Parsing (1) S NP det The S NP N det The actor Parsing Assign elements of its surface structure to linguistic categories. Results in phrase marker (a tree structure; Fig. 6.1) S NP VP N det V thanked The actor S NP VP N det V thanked The actor the S NP VP N det V thanked The actor the audience Fig. 6.1 Five Stages in the parsing of a sentence. (C) 2008, SNU Biointelligence Lab,

6 Parsing (2): Immediacy Principle
As we encounter a word in a sentence, we immediately make decisions about where to place the word into the phrase marker, although we sometimes postpone decisions (Just and Carpenter, 1980). Otherwise, the number of decisions involved in understanding even a sentence can overload our cognitive resources. (1) John bought the flower for Susan. ‘for’ = ‘to give to’ or not? If it’s heard, ‘flower’ has the other interpretation ‘flour’. Immediate processing may lead to errors in parsing. (2) The florist sent the flowers ... At this point ‘sent the flowers’ looks like the main verb phrase. (3) The florist sent the flowers was very pleased. ‘Sent the flowers’ is an embedded relative clause. We are surprised by the continuation in (3). (C) 2008, SNU Biointelligence Lab,

7 Parsing Strategies (1): Late Closure Strategy
Attaching new items to the current constituent (Frazier, 1987; Frazier & Fodor, 1978; Kimball, 1973). (5) Tom said that Bill had taken the cleaning out yesterday. We tend to prefer attaching ‘yesterday’ to the main clause ‘Tom said …’ than to the subsequent subordinate clause ‘Bill had taken …’. (6) Jessie put the book Kathy was reading in the library … We tend to prefer attaching ‘in the library’ to the latter verb ‘reading’. The burden on working memory is reduced. Frazier and Rayner (1982) (7) Since jay always jogs a mile seems like a very short distance to him. Eye fixation times on the last few words were longer than on the earlier ones. This implies that the readers had misinterpreted ‘a mile’ and had to make some later adjustments. – garden path sentence (Ch. 1) (C) 2008, SNU Biointelligence Lab,

8 Parsing Strategies (2): Minimal Attachment Strategy
Using the fewest syntactic nodes in the phrase marker (Frazier, 1987; Frazier & Fodor, 1978) (8) Ernie kissed Marcie and her sister … We prefer to interpret ‘her sister’ as a recipient of a kiss, rather than as the beginning of a new noun phrase. Frazier and Rayner (1982) (9) The city council argued the mayor’s position forcefully. (10) The city council argued the mayor’s position was incorrect. Reading times were faster for (9) than for (10) (Fig. 6.2). Fig. 6.2 Tree diagrams The city council argued the mayor’s position forcefully. NP V adv VP S The city council argued the mayor’s position was incorrect. NP V VP S (a) (b) (C) 2008, SNU Biointelligence Lab,

9 Modular Versus Interactive Models (1)
Modular model Parsing by a syntactic module (Frazier, 1987, 1995) Not influenced by higher-order contextual variables (e.g. the meaning of the sentence) or by general world knowledge These contextual factors influence comprehension at a later stage. Interactive model Syntax and semantics interact (Britt, Perfetti, Garrod, & Rayner, 1992; Crain & Steedman, 1985; Taraban & McClelland, 1988; Tyler & Marslen-Wilson, 1977). Constraint-based model (MacDonald, Pearlmutter, & Seidenberg, 1994; McClelland, 1987; Trueswell, Tanenhaus & Garnsey, 1994) Using all available information (e.g. syntactic, lexical, discourse, nonlinguistic, contextual) in our initial parsing. (C) 2008, SNU Biointelligence Lab,

10 Modular Versus Interactive Models (2)
Much of research examined structurally ambiguous sentences such as (11). (11) The florist sent the flowers was very pleased. (12) The florist sent the flowers to the elderly widow. (13) The florist who was sent the flowers was very pleased. The minimal attachment principle – ‘sent’ in (11) is the verb (MV), as in (12) Parsing is unrelated to the plausibility of real-world events (Rayner, Carlson and Frazier, 1983) (14) The performer sent the flowers was very pleased. Garden path effects (eye fixation) with both plausible (14) and implausible (11) sentences. (C) 2008, SNU Biointelligence Lab,

11 Modular Versus Interactive Models (3)
Parsing is not influenced by a paragraph context (15) The editor played the tape and agreed it was a big story. (minimal attachment) (16) The editor played the tape agreed it was a big story. (nonminimal attachment) Prior context (17) … He gave a tape to his editor and told him to listen to it. (18) … He ran a tape for one of his editors, … (17)  (15) or (16) Sometimes the readers were biased toward a minimal attachment interpretation. (18)  (15) or (16) The nonminimal attachment interpretation was primed. Nevertheless, the readers continued to use the minimal attachment principle. Reaction times for ‘agree’ were longer for (16) than for (15), but no differences were observed between different paragraph contexts. (C) 2008, SNU Biointelligence Lab,

12 Modular Versus Interactive Models (4)
Lexical knowledge is immediately utilized to guide parsing (Trueswell and colleagues, 1994). More favorable to the constraint-based framework. (19) The defendant examined by the lawyer turned out to be unreliable. (20) The evidence examined by the lawyer turned out to be unreliable. Eye fixation were greater when the subject was animate as in (19). (19) permits the incorrect main verb interpretation (garden path effect). Some information other than syntactic strategies (e.g. minimal attachment, late closure) are influencing initial parsing decisions. Recent evidence from brain studies converge on this conclusion (Ch. 13). (C) 2008, SNU Biointelligence Lab,

13 Working Memory and Comprehension (1)
Baddeley’s model of working memory (Ch. 3) The central executive determines what information is attended and what is ignored. Less skilled comprehenders are less efficient in suppression irrelevant information (the central executive of working memory) (Gernsbacher & Faust, 1991; Gernsbacher, Varner & Faust, 1990) ‘He dug with the spade’ – less skilled comprehenders were slower to the meaning of ‘spade’ that pertains to playing cards. (C) 2008, SNU Biointelligence Lab,

14 Working Memory and Comprehension (2)
The concept of modularity is not necessary to explain parsing performance (Just and Carpenter, 1992). Individuals with larger working memories were less likely to show garden path effects in sentences such as (20). Studies of memory load interference in syntactic processing (e.g. Gordon, Hendrick & Levine, 2002) support the above. Participants in the experiment were presented with a short set of words while they read sentences. More comprehension errors were made when the word set matched the words in the sentences. These results indicate that two tasks drew upon the same set of resources. (C) 2008, SNU Biointelligence Lab,

15 Incomplete or Inaccurate Representations
Comprehenders sometimes misinterpret garden path sentences and that misinterpretations may persist even after syntactic reanalysis has taken place (Christianson et al, 2001; Ferreira, 2003). (24) While Anna dressed the baby played in the crib. Participants were presented with sentences like this. (25) Did the baby play in the crib? Virtually 100% correct answers. (26) Did Anna dress the baby? Many incorrect answers. The significance of incomplete or inaccurate representations. People frequently misinterpret what others are saying. We come to the process of sentence comprehension with some expectations (preexisting ideas or preferences). (C) 2008, SNU Biointelligence Lab,

16 (C) 2008, SNU Biointelligence Lab,
Summary Parsing, the process of assigning elements of the surface structure of a sentence to linguistic categories, is the first step in understanding a sentence. As a result of processing limitations, we begin to analyze sentence structure as soon as we see or hear the first words. Two theories of parsing have been discussed. The modular approach suggest that the words of a sentence activate syntactic processing strategies that are used to organize the words into a phrase marker. These strategies indicate that we prefer to attach incoming words to the most recent constituent as opposed to attaching them to earlier constituents or developing new ones. Although the strategies are generally useful, they sometimes lead to errors and subsequent reanalyses of syntactic structure. The interactive approach emphasizes that we use all available information, including lexical, discourse, and contextual factors. Whereas the modular approach insists that syntactically based strategies are used firs, with lexical and discourse factors coming in later, the interactive model asserts that we simultaneously use all available information to parse sentences. Current research supports the role of lexical and contextual factors in parsing, but the role of discourse factors is less evident. Recent research suggests that we sometimes develop incomplete or inaccurate representations of the sentences we encounter. This is more commonly the case when the sentence violates our expectations. (C) 2008, SNU Biointelligence Lab,

17 Comprehending Figurative Language
Summarized by Kim Hyunwoo Biointelligence Laboratory, Seoul National University

18 Figurative language Georege went through the roof.
Birds of a feather flock together. George got very angry. Those of similar taste congregate in groups. (C) 2008, SNU Biointelligence Lab,

19 Types of figurative language
Example Metaphor My lawyer is a snake. Some marriages are iceboxes. Idiom George went through the roof. She's turning over a new leaf with her diet. Metonymy We need to get some fresh legs in the game. The ham sandwich wants a Coke. Proverb Birds of a feather flock together. When the cat's away mice will play. Indirect Speech Act Can you open the window? Would you mind lending me five dollars? (C) 2008, SNU Biointelligence Lab,

20 Metaphor Metaphors consist of three main parts; tenor, vehicle, and ground. Ex) Billboards are warts on the landscape Similarity Between tenor and vehicle (C) 2008, SNU Biointelligence Lab,

21 Figurative language comprehension
Pragmatic Theory Conceptual metaphor Class inclusion theories (C) 2008, SNU Biointelligence Lab,

22 (C) 2008, SNU Biointelligence Lab,
Pragmatic theory True of False ? All jobs are jails. Metaphorically true but literally false. If the metaphoric reading was automatically available at the same time as the literal reading, the response time would be slow down. (C) 2008, SNU Biointelligence Lab,

23 (C) 2008, SNU Biointelligence Lab,
Pragmatic theory Stage 1 The listener extracts the literal meaning of the sentence Stage 2 The listener decides whether the literal meaning is what the speaker intended, based on the context and communicative conventions Stage 3 An indirect meaning based on communicative conventions and the direct speech act (C) 2008, SNU Biointelligence Lab,

24 (C) 2008, SNU Biointelligence Lab,
Pragmatic theory Problem - Literal meaning always should be easier or faster than the figurative meaning in this model. - People should not comprehend a figurative meaning if the literal meaning is acceptable. (C) 2008, SNU Biointelligence Lab,

25 Conceptual metaphor Theory
Metaphors are not creative expressions but rather instantiations of underlying conceptual metaphors. Ex) Time is money. Love is a journey. Gibbs suggests that “what is frequently seen as a creative expression of some idea is often only a spectacular instantiation of specific metaphorical entailments that arise from the small set of conceptual metaphors shared by many individuals within a culture” (C) 2008, SNU Biointelligence Lab,

26 Conceptual metaphor Theory
Evidence - Gibbs found a strong relationship between idiom understanding and domain understanding. - Images for idioms were very similar to one another across participants, but images for nonidiomatic phrases varied considerably. (C) 2008, SNU Biointelligence Lab,

27 Class Inclusion Theory
Metaphors are class inclusion statements. Ex 1) The container held the apples ( = basket) The container held the cola. ( = glass or bottle) Instantiation Identifying a general term with a specific meaning (C) 2008, SNU Biointelligence Lab,

28 Class Inclusion Theory
Metaphors also require a selective activation of information from the lexicon. What do two sentences have in common? ex ) The pianist is a butcher. The surgeon is a butcher. Negative evaluation (C) 2008, SNU Biointelligence Lab,

29 Class Inclusion Theory
Evidence Metaphors are nonreversible. Ex ) My job is a jail ( O ) . My jail is a job ( X ) If metaphor vehicles refer to abstract superordinate categories, then directing a person’s attention to the more literal, basic-level meaning should disrupt comprehension. (C) 2008, SNU Biointelligence Lab,

30 MEMORY FOR SENTENCE Summarized by Kim Hoonhee
Biointelligence Laboratory, Seoul National University

31 MEMORY FOR SENTENCE Goal Contents what we remember
what we do not remember from sentence the way sentences are ultimately stored in permanent memory Contents Memory for Meaning Versus Surface Form Inferences and Sentence Memory Propositions and Sentence Memory

32 Memory for Meaning Versus Surface Form
Sentence Memory concern whether we retain the exact or verbatim wording of a sentence or simply its meaning. Most of the early research : only meaning was retained. Fillenbaum (1966) Study : Remembering heard sentence (multiple-choice test) The window is not closed. (original, most people correctly remembered sentence) The window is closed. The window is not open. the window is open. (if they made an error, they were much more likely to choose this sentence.) the meaning similarity of closed and not open enabled comprehenders to infer one from the other. People in his study drew inferences from contradictories (open and closed) but not from contraries (tall and short).

33 Memory for Meaning Versus Surface Form
Wanner (1974) : surface form versus meaning retention. when you score the results, do nothing to your correct answer but mark carefully those answers which are wrong. your correct → correct your : changes the meaning of the sentence (100% correct on test) mark carefully → carefully mark : mean the same thing (50% correct on test, chance level) when people listen to sentences without knowing they are to be tested on them, they primarily retain the meaning, not the surface form.

34 Memory for Meaning Versus Surface Form - Time Course of Retention
Sachs (1967) : various retention interval. test sentence : original, two that changed the wording but not the meaning, one that changed the wording and the meaning. Retention interval immediately : retention of both form and meaning was excellent 12.5 sec : memory for form declined (40 syllables) more delay : (80 syllables) But, memory for meaning was relatively durable over this time period. The tendency to store only the meaning of a sentence in permanent memory is not limited to spoken languages.

35 Memory for Meaning Versus Surface Form - Pragmatic Factor
Keenan, MacWhinney, and Mayhew (1977) interactional content of an utterance is an important factor in retention under naturalistic conditions (luncheon discussions). high in interactional content (attitude of the speaker toward the listener, figures of speech, jokes, insults, and the like) excellent retention of form as well as meaning of statements. however, under not naturalistic conditions, it does not. the pragmatic function they play in the conversational context. Holtagraves (1997) Subjects remembered polite wording better than impolite wording in an unexpected memory test.

36 Inferences and Sentence Memory
Greater elaboration of processing leads to better retention. Elaboration processing is the drawing of inferences. Johnson, Bransford, and Solomon (1973) : Inference and false recognition error “John was trying to fix the birdhouse. He was looking for the nail when his father came out to watch him and to help him do the work.” (original sentence) The passage does not specifically state that John used a hammer. “John was using the hammer to fix the birdhouse when his father came out to watch him and to help him do the work.” People who heard original sentence falsely believed that they hand heard this sentence.) In normal circumstances, these inferences are adaptive in enabling us to tie sentences in discourse together.

37 Propositions and Sentence Memory
We generally store the gist of what another person has said, rather than the exact form of the sentence. Forms of inference that we draw are based not on purely linguistic knowledge but rather on general world knowledge. linguistically based representational system (such as deep structure in transformational grammar) is a poor candidate for a model of sentence memory. the exact linguistic form is not well retained, nonlinguistic information may play a major role in the retention process.

38 Propositions and Sentence Memory
Propositional models of sentence representation proposition consisting of two or more concepts and some for of relation between them. George hit Harry. Hit (George, Harry) Harry was hit by George. It was Harry who was hit by George. The one who hit Harry was George. More complex sentences convey more than one proposition. George got into an argument with Harry, hit him, and then left the bar. Initiated (George, Harry, argument) Left (George, bar)

39 Propositions and Sentence Memory
a rough description of the way a propositional representation of a sentence might be set up during comprehension is as follows. when we first encounter a sentence, extract its meaning construct a proposition (represents this meaning.) the surface form is being retained in working memory. because the meaning is usually of greater interest, more processing resources are devoted to the meaning than to the surface form. if the surface structure is pragmatically significant, more attention is given to it, with consequently better retention. lead to the drawing of additional propositions (inferences), which are stored along with the propositions of the presented sentences. Unless the sentence was pragmatically striking or the retention interval was very short, only the propositional representational along with any inferences that were drawn will still be stored. our memory for meaning is excellent, but we are susceptible to remembering inferential material falsely. An important advantage of propositional models they can be extended naturally to discourse the meaning representation of two one-proposition sentences is equivalent to that of one two-proposition sentence.

40 Ch 7. Discourse Comprehension and Memory

41 Introduction Connected discourse Reasons of research
Discourse is more natural unit for language research than isolated sentences. Discourse context makes clear the meaning of sentences. Discourse is a rich source of research for cognitive language process. © 2008, SNU CSE BioIntelligence Lab,

42 Comprehension of Discourse
© 2008, SNU CSE BioIntelligence Lab,

43 Local and Global Discourse Structure (1/2)
Sentence arrangement is crucial in discourse comprehension. Hard to understand Easy to understand Carlos arranged to take golf lessons from the local professional. His dog, a cocker spaniel, was expecting pups. Andrea had the car washed for the big wedding. She expected Carlos to help her move into her new apartment. John bought a cake at the bake shop. The cake was chocolate with white frosting, and it read “Happy Birthday, Joan” in red letters. John was particularly pleased with the lettering. He brought it over to Greg’s house, and together they worked on the rest of the details. © 2008, SNU CSE BioIntelligence Lab,

44 Local and Global Discourse Structure (2/2)
Localstructure (Microstructure) Relationship between individual sentences in the discourse Carlos’ story ↔ John’s story Globalstructure (Macrostructure) Our knowledge of the structure corresponding to object, man, topic, etc. John’s story ↔ John bought a cake at the bake shop. The birthday card was signed by all of the employees. The party went on until after midnight © 2008, SNU CSE BioIntelligence Lab,

45 Cohesion The degree to which different parts (words, sentences, paragraphs) of a text are connected to one another. Categories of Cohesion Reference Substitution Ellipsis Conjunction Lexical © 2008, SNU CSE BioIntelligence Lab,

46 Categories of Cohesion(1/3)
Reference: Links between words or phrases Pronominal: she, he, it, his, ... Ex) The woman lost track of her little boy at the mall. She became very worried. Demonstrative: the, this, that, ... Ex) That was the worst exam I had all term. Comparative: same, different, similar, … Ex) It’s the same band we heard last week. © 2008, SNU CSE BioIntelligence Lab,

47 Categories of Cohesion(2/3)
Substitute Replacement one lexical item with another My computer is too slow. I need to get a faster one. Ellipsis Substitute one phrase with nothing Ex) I wish I had more talent. My sister has a lot more than I do. Conjunction And, or, but, yet, so … Ex) Melissa flunked out of school, so she is looking for a job. © 2008, SNU CSE BioIntelligence Lab,

48 Categories of Cohesion(3/3)
Lexical: Lexical relationship between sentences or phrases Reiteration Ex) I saw a boy win the spelling bee. The boy was delighted afterword. Synonymy Ex) I saw a boy win the spelling bee. The lad was delighted afterword. Hyponymy Ex) I saw a boy win the spelling bee. The child was delighted afterword. © 2008, SNU CSE BioIntelligence Lab,

49 Anaphoric & Cataphoric Reference
Anaphoric Reference Ex) The woman lost track of her little boy at the mall. She became very worried. Antecedent: the woman Anaphor: she Related with working memory Cataphoric Reference Ex) This is how you do it. You let the herbs dry and then grind them up in a food processor. © 2008, SNU CSE BioIntelligence Lab,

50 Strategies Used to Establish Coherence
Given/New information Given/New Strategy Identify the given and new information in the current sentence Find an antecedent in memory for the given information Attaching the new information to this spot in memory © 2008, SNU CSE BioIntelligence Lab,

51 Reading Time Paradigm The most often used method to examine the relative ease with which we relate sentences Individuals are shown a sentence and are asked to press a button when they think they have understood it. Measure the time needed to understand the sentence as a function of one or more previous sentences Target sentence © 2008, SNU CSE BioIntelligence Lab,

52 Sentence Relation Strategies and Comprehension (1/2)
Direct matching Ex) We got some beer out of the trunk. The beer was warm. Finding an antecedent Searching for a concept rather than a word Bridging Connecting sentences together without a direct antecedent Ex) Last Christmas Eugene went to a lot of parties. This Christmas he got very drunk again. Longer comprehensive time than direct matching © 2008, SNU CSE BioIntelligence Lab,

53 Sentence Relation Strategies and Comprehension (2/2)
Reinstating old information Ex) Increase comprehension time New topic Detecting topic shifting Explicit markers & subtle cues I am trying to find a black dog. He is short and has a dog tag on his neck that says Fred. Yesterday that dog bit a little girl. She was scared, but she wasn’t really hurt. Yesterday a black dog bit a little girl. It got away, and we are still trying to find it. He is short and has a dog tag on his neck that says Fred. She was scared, but she wasn’t really hurt. © 2008, SNU CSE BioIntelligence Lab,

54 Memory Representation
Hierarchical structure in episodic memory John bought a cake at the bake shop. The cake was chocolate with white frosting, and it read “Happy Birthday, Joan” in red letters. John was particularly pleased with the lettering. He brought it over to Greg’s house, and together they worked on the rest of the details. John bought a cake at shop cake read ... John brought cake to Greg’s house Cake had frosting John liked lettering © 2008, SNU CSE BioIntelligence Lab,

55 Role of Working Memory Working memory Discourse comprehension
? Working memory Discourse comprehension Storage / Processing functions Trade off Background knowledge also influence © 2008, SNU CSE BioIntelligence Lab,

56 Reading span task Examine the trade off Procedure Result
Measure individual reading span Participants read aloud a series of sentences (Processing function) , then recall the final word in each sentence (Storage function) Read a passage and answer questions Result Working memory → Reading span → Comprehension → Verbal SAT © 2008, SNU CSE BioIntelligence Lab,

57 Thinking-out-loud Procedure
High/low working memory groups Read difficult passages aloud Think out loud during the reading Result Low working memory → Short memory span → Concrete/specific inference → Sometimes wrong High working memory → Long memory span → Open inference → More likely to be correct © 2008, SNU CSE BioIntelligence Lab,

58 Summary Coherent discourse : its elements are easily related
Localstructure & globalstructure Categories of cohesion Strategies Working memory © 2008, SNU CSE BioIntelligence Lab,

59 Memory for Discourse 신원진

60 Memory for Discourse Surface representation
Remember the exact words that we encountered Propositional representation of the discourse Specifies the meaning apart from the exact words used Situational model of the discourse A model of the state of affairs in the world as described in the passage

61 Surface Representations
Short-lived presented individuals with a long oral passage that was interrupted at irregular intervals The confidence of Kofach was not unfounded. To stack the meeting for McDonald, the union had even brought in outsiders Kofach had been persuaded by the international to stack the meeting for McDonald. The union had even brought in outsiders Surface or verbatim form of a sentence is stored in working memory only until its meaning is understood, then purged to make room for the next sentence Exception Remember the exact wording of some material when it is distinctive and easily separable from the rest of the discourse

62 Propositional Representations
We often store the meaning of sentences in the form of propositions Cleopatra’s downfall lay in her foolish trust in the fickle political figures of the Roman world Romulus, the legendary founder of Rome, took the women for the Sabine by force The number of propositions is related to reading time Discourse is stored as a network of propositions

63 Propositional Representations
Pairs of sentences that were close in the discourse structure but no in the surface structure, such as sentences 1) and 2), produced larger priming effects than pairs that were close in surface structure but no in discourse structure, such as sentences 3) and 4) Circulation among the Indians was vital The fur traders were nomads Land ownership was not a problem We have a propositional structure, not a verbal representation in episodic memory after we have understood a passage

64 Inferences and Propositional Representations
Inference is intrinsic to discourse structure Authors leave out information that they think readers will be able to figure out Coherence has a greater association with the unitary impression of a passage in the comprehender’s mind than with the completeness of a set of words sitting on a printed page Inference is a proposition in the underlying discourse structure that is intended but not explicitly expressed by the author and thus must be drawn by the reader

65 Inferences and Propositional Representations
Two conditions that automatically draw inferences To make a text locally coherent Information on which the inference is based must be easily activated

66 Inferences and Propositional Representations
When we draw inferences from a text, we store the implicit propositions right alongside the explicit propositions A carelessly discarded burning cigarette started a fire The fire destroyed many acres of virgin forest A burning cigarette was carelessly discarded

67 Situational Models Represent the state of affairs that a text refers to The assumption is that as we comprehend the propositions of a text, we construct a mental or situational model of the world as described by the text Three turtles rested on a floating log, and a fish swam beneath them. Three turtles rested beside a floating log, and a fish swam beneath them. A fish swam beneath a floating log. Comprehenders constructed a spatial layout of the situation rather than stored the individual sentences or propositions

68 Situational Models Survey text with geographic terms(draw test)
North of the highway just east of the river is a gas station Routine text with directions used for driving(recall test) On your left just after you cross the river you see a gas station

69 Situation Models The construction of a situation model influences the accessibility of previous information in discourse In Contrast, accessibility of referents was not related to the time that elapsed since encountering a particular object Comprehenders are constructing a spatial situation model, as opposed to storing sentences in the order in which they were presented

70 Simultaneous Investigations of All Three Levels
Test Items Surface Text: George says that his wife was angry when she found out that the necklace cost more than the (carpet/rug) Propositional Text: George says that his wife was angry when she found out that the necklace cost more than the (carpet/painting) Model Text: George says that his wife was angry when she found out that the necklace cost more than the (carpet/vase)

71 Recognition Memory worst Intermediate Best
when the test sentence and its distractor differed only at the surface level Intermediate They differed at the surface and propositional levels Best They eiffered at all three levels

72 Recognition Performance
Each level of recognition over time Students were presented with passages and then given recognition tests either immediately or after delay of 40 minutes, 2 days, or 4 days.

73 Schemata and Discourse Processing

74 Schemata(1/2) Schema is a structure in semantic memory that specifies the general or expected arrangement of a body of information Bartlett(1932) remembering is not reproductive process but rather a process in which we retain the overall gist of an event and then reconstruct the detail from this overall impression. Event that is discrepant from our usual understanding, it is difficult to fitting in to existing schemata. Two issue Characterizing schematic knowledge more precisely Determining how this knowledge is used during discourse comprehension

75 Schemata(2/2) Activation of Appropriate Schemata
It is more easy to remember a paragraph with title rather than a just paragraph The title can be used to activate an appropriate schema Reconstruction of Schema-Specific Details The activated schema served as a retrieval plan, summoning up certain details An experiment – a text about a burglary Recall test with the perspective of the homeowner or the burglar The subjects were able to recall previously unrecalled propositions after shifting perspective

76 Genres Provide general expectations regarding the way information in a discourse will be arranged. News paper The most important points are introduced in the headline Journal Gradually, as students become aware of where to find various pieces of information if the article, comprehension improves Story Depending of the genre, readers can imagine.

77 Narrative Discourse Processing
Story Grammars A schema in semantic memory that identifies the typical or expected arrangement of events in a story. A setting, one or more episodes, and ending The boundaries between episodes Cognitive activities at the boundaries of the episodes were responsible for the increased reading times. Cross-Cultural Investigations A story grammar could be a universal schema rather than one that is specific to our culture From experiment with U.S. person and Liberia person

78 Inaccessibility of Knowledge
Anomalous suspense When a reader participates in a narrative world in such a fashion that the knowledge critical to sustaining suspense is not immediately accessible. Gerrig’s Experiment When we sit down to read a novel, we expect to encounter new characters and new situations. Thus, rather than searching our memory for previous instances of something new, even when it is not. Readers treat each story as if it were brand new.

79 Summary Schemata direct and guide discourse processing is well established. Different genres are associated with different types of schemata. We tend to store the episodes in memory, and use the ends of episodes as cues to summarize the episode as a whole.

80 185~190

81 Educational Implications
How well we are able to learn from textbooks and lectures? Coherence is achieved during the course of comprehension, not given in the words on the printed page. Educational situation Students do not always remember the most important points in a lecture or passage. The one in which a reasonably well-constructed passage is not understood very well despite a considerable effort at comprehension. Comprehension is poor, memory is usually also poor. All that remembered are isolated details.

82 Educational Implications
A coherent body of information presented to an able and conscientious comprehender ultimately is stored in incoherent and fragmented form. Why? Familiarity Much of what we study is material for which we have o available schema. Learned and remembered is often difficult. Nevertheless, identifying lack of familiarity as a contributing element is only the beginning, not the end, of a satisfactory explanation. With familiar texts, we are scarcely aware of the multiple ambiguities,~, for we are able to resolve most of them rather easily. Unfortunately, we are not able to do this with unfamiliar texts. Local cohesive relation must play a relatively more important role. Careful processing of these local relations can overcome the disadvantage of lack of familiarity. 5 strategies : improving comprehension and memory. Actively processing discourse, Connecting propositions in discourse, Identifying the main points, Building global Structures, Tailoring Comprehension activities to tests

83 Actively Processing Discourse
Active processing : relating new information to information we have in permanent memory, asking questions of the material, and writing summaries or outlines of the material. Palincsar and Brown (1984) : taught the students to formulate questions that would be answered by the most important point in a passage. 30% on a comprehension test before training 80 % on a comprehension posttest McNamara (2004) : the effectiveness of providing reading strategy instruction. (to explain the meaning of information to themselves) The self-explanation group showed improved comprehension of the most difficult texts.

84 Actively Processing Discourse
Of course, The exact type of active processing can be individually designed. Much psychological research has shown that when we process information at this deeper semantic level, we remember more of what we read. Self-reference effect The tendency to remember information better when we relate it to ourselves. It will not only make the reading more interesting , but will also promote retention.

85 Connecting Propositions in Discourse
An intrinsic characteristic of discourse is that sentences overlap in content and that given information is used to introduce new information. We would benefit from a strategy of explicitly looking for relationships between concepts in discourse It produces a network of interrelated propositions in which each concept may serve as a retrieval cue for many others. Even if we do not have the information needed to draw an inference, explicitly searching for such relationships between propositions deepens the level of processing and hence promotes the retention of individual propositions. As propositions are connected to on another, leading to a hierarchical memory structure that may be used to organize our recall of the text or to summarize it.

86 Identifying the Main Points
The difficulty in determining main points may be traced to the presence of distracting and often confusing details. Meyer, Brandt, and Bluth (1980) : The key points of a passage are signaled explicitly, performance improve. Meyer and Poon (2001) : examined the effects of strategy training and signaling on the recall of text. (how to identify the main ideas in a text.) Strategy training led to increased recall performance relative to groups that were given training in assessing their interest in the subject matter or given no training. Strategy training was more effective in improving performance than signaling Reder and Anderson (1980) : retention was better when the material was presented in a condensed version rather than in a standard textbook version. Giora (1993) : analogies in text did not facilitate comprehension and may actually impair recall. Best : when extraneous material is omitted from text.

87 Building Global Structures
We need to identify important point even when they are not so explicitly marked. Test : to write summary for a portion of the text. This requires us to select specific propositions as the most important ones generalize some of the individual propositions into broader thematic statements. By comparing our summary with the author’s, we can see how close we have comp to extracting the gist of the text.

88 Tailoring Comprehension Activities to Tests
We should always try to match our comprehension activities to the types of tests we may have to take. Retention is best We study material in a manner similar to the way we must encode it at the time of a test. Mannes and Kintsch (1987) Student studied an outline of relevant background information before reading text. Two group The organization of the outline was consistent with the organization of the text. The outline was inconsistent with the text The consistent-outline student performed better on memory. But, the inconsistent-outline group showed superior performance on an inference verification task and on a difficult problem-solving task. (required a deep understanding of the passage.) It is not appropriate to say that the presence of a consistent outline improved discourse performance.

89 Tailoring Comprehension Activities to Tests
McNamara and Kintsch (1996) Asked individuals with high vs low levels of knowledge of a given topic to read texts with high vs low levels of coherence. Performance on multiple-choice tests was better for high-coherence texts. High-knowledge readers performed better on the essay questions after reading the low-coherence text. Low-coherence texts require more inferences High-knowledge readers are better able to generate appropriate inferences. There is no one “right” way to study for a test. The type of studying activity that will be most beneficial will depend on the type of test.

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