No language unification without neural feedback: How awareness affects sentence processing
Number of pages
SourceNeuroImage, 202, (2019), article 116063
Article / Letter to editor
Display more detailsDisplay less details
SW OZ DCC PL
PI Group Predictive Brain
Donders Centre for Cognitive Neuroimaging
PI Group Neurobiology of Language
Subject110 000 Neurocognition of Language; 180 000 Predictive Brain; Psycholinguistics; Language in Interaction
How does the human brain combine a finite number of words to form an infinite variety of sentences? According to the Memory, Unification and Control (MUC) model, sentence processing requires long-range feedback from the left inferior frontal cortex (LIFC) to left posterior temporal cortex (LPTC). Single word processing however may only require feedforward propagation of semantic information from sensory regions to LPTC. Here we tested the claim that long-range feedback is required for sentence processing by reducing visual awareness of words using a masking technique. Masking disrupts feedback processing while leaving feedforward processing relatively intact. Previous studies have shown that masked single words still elicit an N400 ERP effect, a neural signature of semantic incongruency. However, whether multiple words can be combined to form a sentence under reduced levels of awareness is controversial. To investigate this issue, we performed two experiments in which we measured electroencephalography (EEG) while 40 subjects performed a masked priming task. Words were presented either successively or simultaneously, thereby forming a short sentence that could be congruent or incongruent with a target picture. This sentence condition was compared with a typical single word condition. In the masked condition we only found an N400 effect for single words, whereas in the unmasked condition we observed an N400 effect for both unmasked sentences and single words. Our findings suggest that long-range feedback processing is required for sentence processing, but not for single word processing.
NWO (Grant code:info:eu-repo/grantAgreement/NWO/Gravitation/024.001.006)
Upload full text
Use your RU credentials (u/z-number and password) to log in with SURFconext to upload a file for processing by the repository team.