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.
Ronquest RE, Levi SV, Pisoni DB.Ronquest RE, et al. Among authors: pisoni db.Atten Percept Psychophys. 2010 Aug;72(6):1601-13. doi: 10.3758/APP.72.6.1601.Atten Percept Psychophys. 2010.PMID: 20675804Free PMC article.