Behavioural studies have shown that dyslexics are a heterogeneous population and between-group comparisons are thus inadequate. Some subjects do not develop dyslexia despite having a deficit implicated in this disorder, which points to protective factors. Dyslexia co-occurs with ADHD, DCD, SLI, and SSD, so that future behavioural studies will need to screen and/or statistically control for othe...

This article examines the importance of developmental designs in dyslexia research using a neuroconstructivist framework. According to neuroconstructivism, the lowest level of impairment should be identified as early as possible, and developmental effects on higher-level cognition examined longitudinally. A number of recent studies proposing candidate low-level impairments have not used such de...

studies have employed phonological processing tasks and have clearly demonstrated that poor phonological skills are a hallmark of developmental dyslexia. While these failures in phonological processing are commonly invoked as causal factors in developmental reading failGuinevere F. Eden* and Thomas A. Zeffiro Georgetown Institute for Cognitive and Computational Sciences Georgetown University Wa...