Abstract
Background: Poor decoding and spelling (literacy) skills have been associated with weak working memory. Aims. The aim of this study was to elucidate the contribution of working memory to literacy progress in students with dyslexia. It has been suggested that working memory can be enhanced by training, which in turn may have a positive effect on reading and spelling abilities (e.g., Peijnenborg et al., 2023). Methods and Procedures: Participants consisted of a specific group of children with dyslexia and weak working memory skills (n = 62). The effect of Cogmed training on decoding and spelling progress during remediation was investigated using a randomized controlled trial with three research groups (experimental: Cogmed training; active control: fixed computerized training; passive control group). Outcomes and results: Findings revealed that the Cogmed training enhanced working memory to a rather small extent and that no effects of the Cogmed training on literacy progress occurred over and above the reading and spelling remediation program. Conclusions and implications: Most likely, Cogmed training does not contribute to literacy development in children with dyslexia. The null results are important information for teachers of this specific group of students, albeit inevitably small samples in intervention studies applied to niche populations increase the risk of type-II errors. Therefore, replication studies are needed.
