Deficient Explicit Access to Phonological Representations Explains Phonological Fluency Difficulties in Greek...

Area of Science:

• Linguistics
• Developmental Psychology
• Neuroscience

Background:

• Children with dyslexia and/or Developmental Language Disorder (DDLD) exhibit phonological processing deficits.
• A key debate concerns whether this deficit involves impaired phonological representations or impaired access to intact representations.

Purpose of the Study:

• To investigate the locus of phonological deficits in children with DDLD using phonological fluency tasks.
• To differentiate between the Degraded Phonological Representations Hypothesis and the Deficient Phonological Access Hypothesis.
• To examine the specificity of phonological fluency deficits using a nonverbal design fluency task.

Main Methods:

• Tested 66 children with DDLD and 83 typically developing (TD) children (ages 6-12) on phonological fluency, design fluency, language, literacy, and phonological skills.
• Analyzed response quantity, switching, and clustering in fluency tasks.
• Controlled for nonverbal IQ and design fluency performance.

Main Results:

• Children with DDLD produced fewer correct responses and switches than TD peers.
• Phonological fluency deficits in DDLD were specific and not explained by nonverbal abilities.
• Clustering patterns did not differ between groups, supporting impaired access over degraded representations.

Conclusions:

• Findings support the Deficient Phonological Access Hypothesis for children with DDLD.
• The phonological deficit in DDLD appears to involve difficulties in accessing intact phonological representations rather than degraded representations themselves.