“…In contrast, those studies that did not incorporate TD participants (n = 11) were more focused on a specific age range (e.g., [6,37,42]). Regarding the etiology of ID, in general, the studies included participants with Down syndrome (DS) (n = 13) [6,22,29,33,34,[36][37][38][39][41][42][43][44], Williams syndrome (WS) (n = 6) [28,35,40,45,47,48], fragile X syndrome (FXS) (n = 6) [2,6,29,34,36,39], autism spectrum disorder (ASD) (n = 3) [33,34,39], and to a lesser extent, other diagnoses such as cerebral palsy (n = 1) [33], global development delay (GDD) (n = 1) [33], and Alexander disease (n = 1) [46] were included. Individuals with nonsyndromic ID were included in two studies [6,7].…”