The resolution of case conflicts from a neurophysiological perspective

Area of Science:

• Psycholinguistics
• Neuroscience
• Linguistics

Background:

• Language processing involves resolving conflicts related to grammatical features like case.
• Ungrammatical German sentences with identical case markings (double subjects/objects) present such conflicts.
• Previous research identified N400 and P600 event-related potential (ERP) effects in double subject constructions.

Purpose of the Study:

• To examine how the brain resolves processing conflicts in ungrammatical German sentences with double case markings.
• To compare the neurocognitive responses to double nominative, double dative, and double accusative constructions.
• To investigate the sensitivity of language comprehension to fine-grained distinctions between grammatical cases.

Main Methods:

• Two event-related potential (ERP) experiments were conducted.
• Participants processed ungrammatical German sentences featuring double subjects (nominative) or double objects (dative or accusative).
• Brain activity was measured, focusing on the N400 (semantic integration) and P600 (syntactic processing) components.

Main Results:

• All tested double case ungrammaticalities elicited a biphasic N400-P600 response.
• Double dative constructions showed a larger P600 effect compared to double nominatives, indicating greater syntactic ill-formedness.
• Double accusative constructions elicited a stronger N400 effect than double nominatives, suggesting more pronounced semantic-thematic integration issues.

Conclusions:

• The human language comprehension system is sensitive to specific case distinctions.
• The brain employs distinct neurocognitive strategies to resolve processing conflicts arising from different types of case violations.
• ERP findings highlight the interplay between syntactic and semantic processing in handling grammatical ambiguity and ungrammaticality.