Although we usually have no trouble finding the right antecedent for a pronoun, the coreference relations between pronouns and antecedents in everyday language are often 'formally' ambiguous. But a pronoun is only really ambiguous if a reader or listener indeed perceives it to be ambiguous. Whether this is the case may depend on at least two factors: the language processing skills of an individual reader, and the contextual bias towards one particular referential interpretation. In the current study, we used event related brain potentials (ERPs) to explore how both these factors affect the resolution of referentially ambiguous pronouns. We compared ERPs elicited by formally ambiguous and non-ambiguous pronouns that were embedded in simple sentences (e.g., "Jennifer Lopez told Madonna that she had too much money."). Individual differences in language processing skills were assessed with the Reading Span task, while the contextual bias of each sentence (up to the critical pronoun) had been assessed in a referential cloze pretest. In line with earlier research, ambiguous pronouns elicited a sustained, frontal negative shift relative to non-ambiguous pronouns at the group-level.The size of this effect was correlated with Reading Span score, as well as with contextual bias. These results suggest that whether a reader perceives a formally ambiguous pronoun to be ambiguous is subtly co-determined by both individual language processing skills and contextual bias.
IntroductionAlmost no conversation goes by without somebody using a pronoun to refer to some object, action or individual. Pronouns are our linguistic 'short-cuts' for maintaining reference to topics that are in the focus of our conversation. In fact, comprehending pronouns is such common practice, we usually feel as if we understand their antecedents immediately (e.g., Clark and Sengul, 1979). Interestingly, we generally do not even notice that the co-reference relations between pronouns and their antecedents in everyday language are often 'formally' ambiguous, that is, when the linguistic features of a pronoun (e.g., male/female, singular/ plural) by itself do not warrant the retrieval of a unique antecedent. For instance, given the sentence-fragment "Bruce Willis hated Al Pacino because he…", most people will automatically take 'Al Pacino' as the antecedent of 'he' (as the most likely continuation of this sentence will describe the characteristics of Al Pacino which he was hated for), even though 'he' might, in principle, also refer to 'Bruce Willis'. In