Typically developing 7 - to 12-yr-old children and children with speech sound disorder were separated into four groups : a trained control group ( TDT ; n = 10 , age 9.6 2.0 yr ) , a nontrained control group ( TDNT ; n = 11 , age 8.2 1.6 yr ) , a trained study group ( SSDT ; n = 10 , age 7.7 1.2 yr ) , and a nontrained study group ( SSDNT ; n = 8 , age 8.6 1.2 yr ) .