Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The number of response–reinforcer occurrences experienced in the last three sessions of NCR during the efficacy evaluation for “excuse me” (filled triangles) and “Kevin” (gray triangles) across progressively increasing window sizes for all children.
