Neural correlates of processing case in adults and children

Area of Science:

• Psycholinguistics
• Neuroscience
• Developmental Psychology

Background:

• Sentence-initial arguments with role-specific case markers are often processed slower than those with default case markers.
• Previous research conflated word order and case, making it difficult to isolate the effect of case marking itself.

Purpose of the Study:

• To disentangle the effects of word order and case marking on sentence processing.
• To investigate how adults and six-year-old children process sentence-initial ergative and absolutive case markers in Basque using electroencephalography (EEG).

Main Methods:

• Two EEG experiments were conducted.
• Participants included adults and six-year-old children.
• The processing of ergative and absolutive case markers in sentence-initial position in Basque was analyzed.

Main Results:

• Ergative case markers elicited theta power synchronization compared to absolutive case markers in both adults and children.
• Adults showed beta power desynchronization when processing ergative case markers, while children exhibited synchronization.
• These findings suggest differences in the retrieval of relational information and top-down processing between age groups.

Conclusions:

• Ergative case marking involves retrieving specific relational information, reflected in theta synchronization.
• Adults utilize developed top-down processing for case marking integration, indicated by beta desynchronization.
• Six-year-old children are still developing these top-down mechanisms for parsing case information.