“…Since Scarborough’s study, IPSyn has been used to investigate the grammatical development of various groups of children, including typically developing toddlers (Horton-Ikard, Ellis Weismer, & Edwards, 2005; Rispoli & Hadley, 2001); children who are at risk for language delays (Thal, Reilly, Seibert, Jeffries, & Fenson, 2004); children who are late to talk (Rescorla, Dahlsgaard, & Roberts, 2000; Thal et al, 2004); children with hearing impairments (Tomblin, Spencer, Flock, Tyler, & Gantz, 1999); children with specific language impairment (SLI; Hadley, 1998a; Hewitt, Hammer, Yont, & Tomblin, 2004; Rice, Redmond, & Hoffman, 2006); and children who have been diagnosed with other clinical conditions such as autism, Down syndrome, and Fragile X syndrome (Price et al, 2008; Rollins & Snow, 1998; Scarborough, Rescorla, Tager-Flusberg, Fowler, & Sudhalter, 1991; Thordardottir, Chapman, & Wagner, 2002). For example, Hadley (1998a) used IPSyn to track the morpho-syntactic development of 20 mainstream English–speaking children with SLI when they were between the ages of 2 and 3 years.…”