Tracy Packiam Alloway, PhD

Students with dyspraxia (DCD) can also have comorbid language impairments (SLI). While these developmental disorders are distinguished by the domain of principal deficit, they are both associated with significant learning difficulties. Studies that followed 7-year olds with dyspraxia found that they struggled with reading and comprehension by the time they were 10 years old. I wanted to know whether the combination of motor coordination difficulties plus language impairments lead to worse learning outcomes compared to those with only motor coordination difficulties or language impairments. I looked at three groups of students: 1) those with SLI but no dyspraxia; 2) those with dyspraxia but normal language skills; 3) those with dyspraxia + language impairments.

There were two key findings. First, visual-spatial memory was the single best test to successfully distinguish a student with dyspraxia from those with language impairments. If you have a student with dyspraxia but normal language skills, their memory profile is the same as those with dyspraxia + language impairments: they will have marked difficulties in visual-spatial working memory. The second finding was that despite relative strengths in language, those with dyspraxia but no language impairments performed as poorly as the group with dyspraxia + language impairments. This means that for a student with dyspraxia their working memory abilities determine their learning difficulties. Any strength in language that they have is not able to sufficiently support their learning. If their working memory is not addressed, then any additional strengths they have, such as in language, will not provide a sufficient platform for learning.

Alloway and Archibald (2008). Journal of Learning Disabiliities. READ