Phonological code retrieval during picture naming: Influence of consonant class

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Speech Production

Background:

• Lexical processing research shows varied timing for phonological code retrieval.
• The influence of segmental phonology on this timing remains unclear.
• Previous studies present conflicting evidence regarding early vs. late phonological encoding.

Purpose of the Study:

• To investigate if consonant type affects phonological encoding during object naming.
• To determine the temporal dynamics of phonological processing based on initial consonant sounds.
• To clarify the role of segmental features in the speech production pathway.

Main Methods:

• Undergraduate students named common objects presented visually.
• Stimuli included object labels starting with liquid (/l/, /ɹ/) or stop (/b/, /d/) consonants.
• Event-related potentials (ERPs), specifically N2 responses, were measured.

Main Results:

• Picture naming accuracy was high and similar for both liquid and stop consonant sets.
• Words with initial liquid consonants elicited significantly larger N2 ERP responses compared to stop consonants.
• Cluster permutation analysis revealed differences in ERPs between 293 ms and 371 ms post-stimulus onset.

Conclusions:

• Findings suggest a late onset for phonological code retrieval.
• Results indicate that consonant type, specifically liquids vs. stops, impacts phonological encoding.
• These insights have implications for understanding segmental phonology and speech motor planning.