Hierarchical planning abilities in children with specific language impairments

Area of Science:

• Developmental Psychology
• Linguistics
• Cognitive Science

Background:

• Cromer (1983) proposed a hierarchical planning deficit in children with specific language impairments (SLI).
• This deficit was hypothesized to affect both language and complex construction tasks.
• Recent research suggests greater modularity in cognitive development.

Purpose of the Study:

• To investigate whether children with SLI exhibit a generalized hierarchical planning deficit.
• To compare the performance of children with SLI and typically developing children on hierarchical construction tasks.
• To re-evaluate the link between language abilities and hierarchical planning in non-linguistic domains.

Main Methods:

• Recruited 30 boys (ages 5-7), 15 with SLI and 15 typically developing.
• Assessed performance on four hierarchical construction tasks: block, puzzle, simple straw, and complex straw.
• Provided sequential strategy training for the complex straw construction task for those who failed.

Main Results:

• Comparable performance between groups on the easiest (block) and hardest (complex straw) constructions.
• Significant performance differences observed on the puzzle and simple straw constructions.
• Group differences were also evident on the sequential strategy training task.

Conclusions:

• The findings do not support a central hierarchical planning deficit affecting both language and non-language tasks in children with SLI.
• Language and complex construction skills may rely on more autonomous or modular systems, especially after early development.
• The notion of a unified hierarchical planning mechanism underlying diverse complex structures is questioned.