“…The present study attempts to better understand the difficulty Rett children have with this aspect of attention and identify factors influencing it. Sustained attention, which is thought to involve top-down connectivity extending from the anterior attention system, particularly prefrontal and parietal regions in the right hemisphere, right down into V1 (Grahn & Manly, 2012;Sarter, Givens, & Bruno, 2001;Silver, Ress, & Heeger, 2007), has repeatedly been found to be compromised across a wide range of neurological and psychiatric disorders, e.g., ADHD, autism, bipolar disorder and Fragile X (Cornish, Scerif, & Karmiloff-Smith, 2007;Cornish, Turk, & Levitas, 2007;Fortenbaugh et al, 2015;O'Connell, Bellgrove, Dockree, & Robertson, 2004) While sustained attention is often tested in adults with the continuous performance test, the verbal instructions and motoric requirements preclude using this task in children with RTT.…”