“…Vocal language interventions for individuals with ASD who have limited imitative speech have involved a variety of behaviorally based strategies (Ross & Greer, 2003). One strategy is to reinforce vocalizations differentially (Drash, High, & Tudor, 1999;Esch, Carr, & Grow, 2009;Esch, Carr, & Michael, 2005;Thomas, Lafasakis, & Sturmey, 2010), and another is prompt delay (Charlop, Schreibman, & Thibodeau, 1985;Charlop & Trasowech, 1991;Matson, Sevin, Fridley, & Love 1990). These strategies have been found to meet the standards of evidence-based practice for individuals with ASD (Wong et al, 2015).…”