Visual Attention, Orthographic Word Recognition, and Executive Functioning in Children With ADHD, Dyslexia, or ADHD + Dyslexia.

The current study examined the differences in visual selective attention, orthographic word recognition, and executive functioning. One hundred and forty Ecuadorian children in third and fifth grades of elementary school (8-10 years old) participated in the study-35 with only dyslexia (DD), 35 with the combined type of attention deficit and hyperactivity disorder (ADHD-C), 35 with disorders (DD + ADHD-C), and 35 typical development children (TD). The Ecuadorian children with DD and/or ADHD-C in this age range usually have difficulties in visual selective attention, and also in orthographic word recognition. The executive functioning results showed that such functioning was worse in the ADHD-C groups (with or without DD), but not in the DD group, supporting the dissociation between DD and ADHD-C in executive functioning in this population. Conclusion: The DD + ADHD-C comorbidity produces worse deficits compared to DD, but not compared to ADHD-C, supporting the idea that there are common factors in DD and ADHD-C.