Comprehension monitoring is the process by which a reader evaluates the state of their understanding of information, and it is considered an essential element in the ways in which individuals' reading comprehension can be influenced. However, the processes and mechanisms underlying this skill are not well understood. Previous research on reading comprehension monitoring has mostly focused on simple sentence level, with less exploration of complex sentence level. In Chinese complex sentences, conjunctions play a particularly important role in indicating the relationships between sentence components. Therefore, it is necessary to explore the effect of conjunctions in the monitoring process of understanding Chinese complex sentences. This study aims to investigate the mechanisms by which conjunctions influence comprehension monitoring when reading Chinese complex sentences.
Using event-related brain potentials (ERPs) with an error detection paradigm, a 2 (world knowledge: consistent vs. inconsistent) × 2 (conjunction relation: causal vs. transitional) within experimental design was adopted. Four conditions were formed by crossing conjunction relation and world knowledge: because-congruent sentences, because-incongruent sentences, transitional-congruent sentences, transitional-incongruent sentences. Mean sentence rationality, predictability, word frequency, and number of strokes were balanced across these four types of sentences. ERP data were recorded with a 64-channel Ag-Agcl Neuroscan 4.5 (Neuroscan Inc., Sterling, VA) with a common-vertex online reference, which was transformed offline to the mean of the activity at the two mastoids. E-prime 2.0 software was used for programming. Trials began with a fixation cross that remained on the screen for 1000 ms. Then, the sentence stimuli were presented word by word. Each word was presented for 400 ms, with an inter word interval of 400 ms. For the filler sentences, the participants were asked to answer a true/false comprehension question. Half of the questions required a “true” response, and half required a “false” response. The formal experiment was divided into four blocks of 60 sentences each, with short breaks between blocks. This ERP experiment lasted approximately 1.5 hours.
The ERP results revealed that causal sentences elicited a larger N400 during 300~500ms time window and a smaller P600 around 500-800ms time window as compared to the transitional sentence. By contrast, the world knowledge inconsistency elicited a larger P600 during the time window of 500~800ms than did the world knowledge consistency. More importantly, significant interaction between world knowledge and conjunction relation was also found for P600. Further analysis showed that when the sentence was transitional, the sentences with the world knowledge inconsistency elicited the larger P600 than the world knowledge consistency. However, the world knowledge effect was not found in causal sentences.
In conclusion, these results suggest that both world knowledge and conjunction relation could play a role in Chinese complex sentence reading. But the conjunction relation was found to be earlier as it was firstly reflected by N400 effects which a component was proved to indicate the semantic processing. In addition, the comprehension monitoring process during Chinese complex sentence reading is modulated by conjunction information, as reflected by the P600 component. This modulation is specifically manifested by the inconsistency of world knowledge in transitional sentences triggering a larger P600, whereas no such effect is observed in causal sentences. In other words, conjunctions relation plays a priority role in Chinese compound sentence reading, whereas comprehension monitoring occurs at a late stage and is regulated by conjunctions. It can be seen that conjunctions play a crucial role in reading Chinese complex sentences.
The innovations of this study include two aspects. On the one hand, the study found that comprehension monitoring is associated with a late positive-going neural response-the P600, and the process is modulated by the conjunction relation. On the other hand, the study provides evidence for the neural substrates for the comprehension monitoring process of Chinese complex reading. In future studies, it will be important to determine how comprehension monitoring mechanisms are involved in the detection and resolution of more global discourse errors.
Key words
Chinese complex sentence /
comprehension monitoring /
world knowledge /
conjunction relation /
ERPs
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