Interactions between lexical and sublexical processes in written production: Evidence from two ERP experiments

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Computational Linguistics

Background:

• Understanding the cognitive processes underlying written word production is crucial for fields like education and clinical linguistics.
• The Chinese writing system, with its logographic nature, presents unique challenges and opportunities for studying the interplay between lexical and sublexical processing.

Purpose of the Study:

• To investigate the temporal dynamics of lexical and sublexical processing during Chinese spelling-to-dictation.
• To examine the influence of character frequency (CF) and regularity on these processes using event-related potentials (ERPs).
• To differentiate shared cognitive mechanisms from those specific to orthographic production.

Main Methods:

• Two ERP experiments were conducted involving Chinese participants.
• Experiment 1: Participants performed spelling-to-dictation of two-character disyllabic words.
• Experiment 2: Participants performed an auditory lexical decision task, with character frequency and regularity manipulated in both.

Main Results:

• Consistent character frequency effects were observed in the N2 and late N400 ERP windows across both tasks, indicating shared lexical access and competition.
• Crucially, interactions between character frequency and regularity emerged specifically in the P2 and P3 intervals during spelling-to-dictation.
• These interactions suggest processes unique to orthographic production, potentially involving sublexical-to-orthographic mapping and response preparation.

Conclusions:

• The findings support an interactive dual-route account of spelling, where lexical and sublexical information are integrated during written word production.
• The Chinese writing system significantly shapes the temporal unfolding of orthographic production, influencing how linguistic information is translated into written form.
• ERP data provides critical insights into the real-time cognitive mechanisms governing the complex process of spelling.