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      Frequency-based Segregation of Syntactic and Semantic Unification during Online Sentence Level Language Comprehension.

      1 , 2 , 1

      Journal of cognitive neuroscience

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          Abstract

          During sentence level language comprehension, semantic and syntactic unification are functionally distinct operations. Nevertheless, both recruit roughly the same brain areas (spatially overlapping networks in the left frontotemporal cortex) and happen at the same time (in the first few hundred milliseconds after word onset). We tested the hypothesis that semantic and syntactic unification are segregated by means of neuronal synchronization of the functionally relevant networks in different frequency ranges: gamma (40 Hz and up) for semantic unification and lower beta (10-20 Hz) for syntactic unification. EEG power changes were quantified as participants read either correct sentences, syntactically correct though meaningless sentences (syntactic prose), or sentences that did not contain any syntactic structure (random word lists). Other sentences contained either a semantic anomaly or a syntactic violation at a critical word in the sentence. Larger EEG gamma-band power was observed for semantically coherent than for semantically anomalous sentences. Similarly, beta-band power was larger for syntactically correct sentences than for incorrect ones. These results confirm the existence of a functional dissociation in EEG oscillatory dynamics during sentence level language comprehension that is compatible with the notion of a frequency-based segregation of syntactic and semantic unification.

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          Author and article information

          Journal
          J Cogn Neurosci
          Journal of cognitive neuroscience
          1530-8898
          0898-929X
          Nov 2015
          : 27
          : 11
          Affiliations
          [1 ] Radboud University.
          [2 ] NHTV Breda University of Applied Sciences.
          Article
          10.1162/jocn_a_00829
          10.1162/jocn_a_00829
          26042498

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