“…This approach to developmental intervention is derived from parenting studies that indicate parental responsiveness is one of the major social environmental influences on the development of young children. This research has been reported for diverse groups of children ranging from typically developing children (Bornstein & Tamis-LeMonda, 1997; Tamis-LeMonda, Bornstein, & Baumwell, 2001), to children at risk due to prematurity (Beckwith & Rodning, 1996;Landry, Smith, Swank, Assel, & Vellet, 2001), social environmental disadvantage (Landry, Smith, Miller-Loncar, & Swank, 1997), or adoption (Stams, Juffer, & van Ijzendoorn, 2002;van Londen, Juffer, & van Ijzendoorn, 2007), as well as children with significant developmental disabilities (Yoder & Warren, 1999) including autism (Siller & Sigman, 2002, 2008 and Down syndrome (Mahoney, Finger, & Powell, 1985).…”