«Based on linguistic analysis including computational phylogenetics,» Sicoli writes, «we suggest the prehistory of South Alaska, the Aleutian Islands, and the Pacific Northwest Coast
involved intensive language contacts, including language shifts from now extinct languages that we can infer through typological features, grammar and vocabulary found in languages documented in historic periods.»
Participating children had higher rates of high - school completion, lower rates of grade retention and special education placement, and a lower rate of juvenile arrests.32 Another example showing more
intensive programming has larger impacts is the Healthy Steps evaluation showing significantly better child
language outcomes when the program was initiated prenatally through 24 months.33 These studies suggest that a more
intensive intervention
involving the child directly may be required for larger effects to be seen.