- Language Disorder: Participants will evidence expressive and receptive language disorders as indicated by a combination of standard scores 1.3 Standard Deviations below the mean for their age on at least 3 of the 4 Core Subtests of the CELF-IV, and on at least one of the following: Test for the Reception of Grammar, Expressive Vocabulary Test, or the Peabody Preschool Vocabulary Test will be included.