Brain potential correlates of number errors in the Turkish language

Area of Science:

• Psycholinguistics
• Neuroscience
• Computational Linguistics

Background:

• Understanding how the brain processes grammatical information is crucial for psycholinguistics and neuroscience.
• Previous research on event-related potentials (ERPs) has explored number agreement in various languages.
• Turkish, a morphologically rich language, presents a unique case for investigating number agreement processing.

Purpose of the Study:

• To investigate the neural correlates of number agreement processing in native Turkish speakers using ERPs.
• To examine how number incongruency affects brain activity in the context of Turkish sentence comprehension.
• To compare ERP findings in Turkish with existing literature from other languages.

Main Methods:

• 16 native Turkish speakers participated in the study.
• Event-related potentials (ERPs) were recorded from 19 scalp channels.
• Participants viewed Turkish sentences with manipulated verb number (correct/incorrect) and semantic appropriateness (appropriate/inappropriate/pseudoverb).

Main Results:

• A more positive ERP waveform was observed at left fronto-temporal sites around 200 ms for number-incongruent verbs, irrespective of semantic context.
• A more negative waveform was detected at right fronto-temporal sites specifically for plural verbs.
• These number incongruency effects in Turkish diverge from findings reported for other languages.

Conclusions:

• Turkish speakers exhibit distinct ERP patterns for number agreement violations.
• The observed effects suggest language-specific neural mechanisms for processing grammatical number.
• This study highlights the importance of considering typological differences in cross-linguistic ERP research.