The relationship between cognitive control and lexical conflict resolution in developmental dyslexia

Area of Science:

• Cognitive Neuroscience
• Developmental Psychology
• Educational Psychology

Background:

• Cognitive control (CC) aids in resolving lexical interference.
• Developmental Dyslexia (DD) is associated with CC deficits and slowed lexical retrieval (Rapid Automatized Naming - RAN).
• The interplay between CC, lexical retrieval, and reading difficulties in DD requires further investigation.

Purpose of the Study:

• To investigate the relationship between cognitive control functions, lexical retrieval, and lexical interference resolution in adolescents with DD.
• To compare cognitive control and naming performance in individuals with DD, poor readers (PR), and typical readers (TR).

Main Methods:

• Adolescents with DD (n=38), PR (n=25), and TR (n=33) were assessed on CC tasks (Stroop, Stop Signal, Simon, Backward Digit Span, n-back).
• Lexical retrieval and conflict resolution were evaluated using RAN tasks with semantically homogeneous and mixed picture sets.
• Naming times and interference effects (difference scores) were analyzed across groups.

Main Results:

• Individuals with DD exhibited longer naming times and a greater lexical interference effect in the RAN task compared to TR.
• Significant group differences in CC measures were observed, with TR and PR performing better than DD (TR = PR > DD).
• Naming time correlated with CC abilities, but the lexical interference effect did not show a significant association with CC.

Conclusions:

• Adolescents with DD demonstrate impairments in cognitive control, lexical retrieval, and lexical conflict resolution.
• Cognitive control functions appear to be involved in the process of lexical retrieval.
• Evidence does not support the involvement of cognitive control in resolving lexical interference in this population.