The content is available as a PDF (870.7 KB).
. 1981 May 1;1(5):471–477. doi: 10.1523/JNEUROSCI.01-05-00471.1981
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.