Conjunctions play a crucial role in the construction of a coherent mental representation by signaling coherence relations between clauses, especially for second language users. By using event-related potentials (ERPs), this study aimed to investigate how different conjunctions ( so, and, although, or a full stop) affect the interpretation of a following ambiguous pronoun for both native and non-native speakers, in sentences such as Lily disappointed Nina, so she …. ERP results showed that relative to so, and, and full stop sentences, the pronoun in although clauses elicited a larger Nref (sustained negativity) response in both native (L1) readers and second language (L2) readers, irrespective of whether the verb in the first clause biased towards a particular noun phrase (NP) referent. Moreover, larger Nrefs to pronouns were seen in L2 than L1 readers when clauses were connected by so, although or a full stop. Additionally, larger Nref responses were evoked by pronouns in NP2- than NP1-biased conditions when the clauses were connected by the conjunction so or when sentences contained no overt conjunctions ( full stop). These findings indicate that different conjunctions exert different modulating effects on resolving referential uncertainty/ambiguity. Relative to native speakers, non-native speakers are more likely to encounter referential uncertainty when the sentences are conjoined by conjunctions with more complex semantics.

Temporal connectives play a crucial role in marking the sequence of events during language comprehension. Although existing studies have shown that sentence comprehension can be modulated by temporal connectives, they have mainly focused on languages with grammatical tense such as English. It thus remains unclear how temporal information is processed in tenseless languages. The present study used event-related potentials (ERPs) to examine how world knowledge is retrieved and integrated in sentences linked by zhiqian (before) and zhihou (after) in Mandarin Chinese (e.g., After/Before going to the countryside, Grandpa went to the city because the air there was fresh and pure). The critical words (e.g., fresh) were either congruent or incongruent with world knowledge. Relative to the after-congruent sentences, the after-incongruent sentences evoked a P600 on critical words and a negativity on sentence-final words, whereas relative to before-congruent sentences, before-incongruent sentences showed no significant difference on critical words but a sustained negativity on sentence-final words. Additionally, before-congruent sentences elicited a larger sustained positivity (P600) than after-congruent sentences. The results suggest that before is more difficult to process than after in Mandarin Chinese, supporting the iconicity account of temporal relations.