One gene in particular, CNTNAP2 (contactin associated protein-like 2), has been implicated in SLI, autism, and ADHD [16,18,19]; in the context of SLI, this gene was associated across three language-related measures: nonword repetition (NWR) scores, Clinical Evaluation of Language Fundamentals (CELF) expressive language scores (ELS), and CELF receptive language scores (RLS) [16], all of which have been employed in the present study. Here, CNTNAP2 is linked to attention deficit-hyperactivity disorder.