An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Perlman D, Stickgold R.Perlman D, et al.Proc Natl Acad Sci U S A. 1977 Jun;74(6):2518-22. doi: 10.1073/pnas.74.6.2518.Proc Natl Acad Sci U S A. 1977.PMID: 329289Free PMC article.
Perlman D, Halvorson HO, Cannon LE.Perlman D, et al.Proc Natl Acad Sci U S A. 1982 Feb;79(3):781-5. doi: 10.1073/pnas.79.3.781.Proc Natl Acad Sci U S A. 1982.PMID: 7038684Free PMC article.
Perlman D, Raney P, Halvorson HO.Perlman D, et al.Proc Natl Acad Sci U S A. 1986 Jul;83(14):5033-7. doi: 10.1073/pnas.83.14.5033.Proc Natl Acad Sci U S A. 1986.PMID: 3523480Free PMC article.