Semantic and structural anomaly processing across arithmetic and natural language: An ERP study

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Mathematical Cognition

Background:

• The debate on shared versus distinct neural mechanisms for arithmetic and language processing persists, especially concerning semantic and structural anomaly detection.
• Previous research has not fully elucidated how different representational formats (symbolic vs. verbal) influence these processing mechanisms.

Purpose of the Study:

• To investigate whether semantic and structural anomaly processing in symbolic arithmetic, verbal arithmetic, and factual statements rely on shared or distinct neural pathways.
• To examine the temporal dynamics and representational format sensitivity of anomaly detection using event-related potentials (ERPs).

Main Methods:

• An electroencephalography (EEG) study involving 39 native Russian speakers.
• Participants judged the semantic correctness of symbolic arithmetic, verbal arithmetic (in Russian), and factual statements (in Russian) while structural violations were task-irrelevant.
• Event-related potentials (ERPs), specifically N400, Late Algebraic Negativity (LAN), and P600 components, were analyzed.

Main Results:

• Semantic anomalies elicited a comparable N400-like response across all three expression types, suggesting similar meaning-related anomaly processing.
• Structural anomaly processing showed format-dependent effects: an early effect (300-500 ms) was clearest in symbolic arithmetic, while a later P600 effect was observed in symbolic arithmetic and factual statements, but not verbal arithmetic.
• Verbal arithmetic did not exhibit a consistent ERP profile, indicating it is not simply a verbalization of symbolic arithmetic or ordinary language.

Conclusions:

• Findings support a stage-dependent model of partial convergence and divergence in arithmetic and language processing, rather than fully shared or segregated systems.
• Semantic anomaly processing appears to be a general mechanism, while structural anomaly processing is sensitive to the representational format.
• Verbal arithmetic constitutes a distinct processing category, necessitating specialized models beyond simple linguistic or symbolic arithmetic accounts.