This study compares the processing of cleft structures against that of monoclausal sentences using event-related potential (ERP). We aim to understand how syntactic complexity is processed by comparing the neural response to cleft and single-clause sentences with identical verb phrases, controlling for verb bias frequency effects. 60 participants were tested, and we presented 100 cleft and 100 monoclausal sentences, balanced for active and passive verb usage. The P600 component, which is associated with syntactic complexity, was examined to assess the processing load of cleft structures. Results showed that cleft structures incur a greater processing load, as indicated by a P600, compared to monoclausal sentences. This indexed the increased difficulty of processing the additional syntactic operation required to parse cleft sentences. These findings echo the results of behavioral studies of sentence comprehension on clinical populations.
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