Processing of syllable stress is functionally different from phoneme processing and does not profit from literacy...

Area of Science:

• Cognitive Neuroscience
• Developmental Psychology
• Linguistics

Background:

• Speech processing involves distinct phonemic and prosodic information.
• Neurocognitive studies suggest separate processing pathways for phonemes and prosody.
• Literacy acquisition in childhood refines phoneme processing, particularly with alphabetic systems.

Purpose of the Study:

• To investigate whether enhanced phoneme sensitivity during literacy acquisition extends to prosodic processing in middle childhood.
• To examine the developmental trajectories of phoneme and prosody processing.
• To determine if alphabetic literacy acquisition influences the processing of speech prosody.

Main Methods:

• Utilized a stress priming paradigm with German words to assess prosodic and phonemic processing.
• Orthogonally varied stress and phoneme overlap between spoken primes and target words.
• Collected behavioral (lexical decision) and electrophysiological (Event-Related Potentials - ERPs) data from pre-reading preschoolers, reading pupils, and adults.

Main Results:

• Behavioral and ERP results showed comparable patterns across age groups.
• Fastest responses occurred when primes and targets shared both stress and phonemes.
• ERP stress priming and phoneme priming effects emerged around 200 ms post-target onset.
• Bilateral ERPs showed enhanced amplitudes for stress overlap, while left-lateralized ERPs showed reduced amplitudes for phoneme overlap.

Conclusions:

• Enhanced phonological processing during middle childhood literacy acquisition is specific to phonemes and does not extend to prosody.
• Findings support the existence of parallel processing systems for phonemes and prosody.
• These systems may follow distinct developmental paths influenced by alphabetic literacy acquisition.