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Reference and Reference Shift: The Time Course of Pronoun Assignment

 Kristina Fletcher and Garry Wilson
  
 

Abstract:
What does it actually mean when it is claimed that a pronoun has been assigned to its antecedent? Is it possible to determine whether pronoun assignment has occurred if comprehension is measured at only one location in a sentence? Research suggests that text representations are dynamic (e.g. Greene, McKoon and Ratcliff, 1992) but has failed to investigate them in a dynamic way. Measurements of comprehension that take place only at the referring expression dont allow us to determine whether or not pronoun assignment has started or ended. Previous research has implicitly accepted the immediacy assumption (Just and Carpenter, 1980) that each word in a discourse is immediately interpreted as deeply as possible. Eye fixations are therefore maintained until processing has finished ( the eye-mind assumption). Consequently, researchers have accepted processing differences at referring expressions as evidence for immediacy in reference resolution (e.g. Ehrlich, 1980, Hielscher and Musseler, 1990, Sichelschmidt and Gunther, 1990). Other evidence suggests that resolution may be delayed until post- pronominal information is read (Ehrlich and Rayner, 1983, Garrod, Freudenthal and Boyle, 1994, Hirst and Brill, 1980, Stevenson and Vitkovitch, 1986).

In two word-by-word self paced reading tasks we manipulated shifts in the focus of attention at two different sentence locations. Two characters were introduced into each sentence, one character occupied a thematic role that led to a focusing bias towards that character (Arnold, 1997; Stevenson, Crawley and Kleinman 1994; Wilson and Stevenson, 1998). This focus was either shifted or maintained by a pronominal reference (with a gender cue in expt. 1; no cue in expt. 2) and at a subsequent verb (which could only be sensibly interpreted in relation to one of the characters). This region either maintained the reference established at the pronoun or produced another reference shift. The results indicate that the first reference shift to the non focused character (whether at the pronoun or at the verb) increased processing time. A second shift incurred no processing cost. This suggests that the processes involved in the resolution of pronouns may be initiated before a pronoun is encountered. Focus may be conceived of as a type of pragmatic cue which allows readers to predict the most likely candidate for resolution in conjunction with the degree of markedness within the referring expression itself (e.g. Ariel, 1988, Givon, 1983). Furthermore the results suggest that the resolution process is not completed when the pronoun is fixated. The resolution of unambiguous pronouns (experiment 1) could have been completed when the pronoun was fixated. The results suggest that information after the pronoun affected the resolution process. In the case of ambiguous pronouns (experiment 2) although resolution could not take place at the pronoun, verb reading times suggest readers still preferred to assign the pronoun to the focused individual. Example of materials:
John bought the car from Anne and he/she decided to drive/walk home through the countryside.

Ariel, M. (1988) "Referring And Accessibility." Journal of Linguistics, 24 65-87
Arnold, J. (1997) " The Role Of Frequency In Reference Processing." Paper presented at the Stanford Linguistics Colloquium, 5th June 1997
Ehrlich, K. (1980) "Comprehension of Pronouns." Quarterly Journal of Experimental Psychology, 32 247-255
Ehrlich, K. & Rayner, K. (1983) "Pronoun Assignment and Semantic Integration During Reading: Eye Movements and Immediacy of Processing." Journal of Verbal Learning and Verbal Behaviour, 22 75- 87
Garrod, S., Freudenthal, D. And Boyle, E. (1994) "The Role of Different Types of Anaphor in The On-Line Resolution of Sentences In A Discourse." Journal of Memory and Language, 33 39-68

 
 


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