Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

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.

Https

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.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Search Page

Filters

My Custom Filters

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

11,585 results

Filters applied: . Clear all
Results are displayed in a computed author sort order. The Publication Date timeline is not available.
Page 1
Optimizing Care for Ugandans with Untreated Abdominal Surgical Conditions.
Butler EK, Tran TM, Fuller AT, Muhumuza C, Williams S, Vissoci JRN, Luboga S, Haglund MM, Makumbi F, Galukande M, Chipman JG. Butler EK, et al. Among authors: williams s. Ann Glob Health. 2019 Apr 1;85(1):50. doi: 10.5334/aogh.2427. Ann Glob Health. 2019. PMID: 30951271 Free PMC article.
Mach bands as empirically derived associations.
Lotto RB, Williams SM, Purves D. Lotto RB, et al. Among authors: williams sm. Proc Natl Acad Sci U S A. 1999 Apr 27;96(9):5245-50. doi: 10.1073/pnas.96.9.5245. Proc Natl Acad Sci U S A. 1999. PMID: 10220451 Free PMC article.
Perceiving the intensity of light.
Purves D, Williams SM, Nundy S, Lotto RB. Purves D, et al. Among authors: williams sm. Psychol Rev. 2004 Jan;111(1):142-58. doi: 10.1037/0033-295X.111.1.142. Psychol Rev. 2004. PMID: 14756591 Review.
An empirical basis for Mach bands.
Lotto RB, Williams SM, Purves D. Lotto RB, et al. Among authors: williams sm. Proc Natl Acad Sci U S A. 1999 Apr 27;96(9):5239-44. doi: 10.1073/pnas.96.9.5239. Proc Natl Acad Sci U S A. 1999. PMID: 10220450 Free PMC article.
The influence of depicted illumination on brightness.
Williams SM, McCoy AN, Purves D. Williams SM, et al. Proc Natl Acad Sci U S A. 1998 Oct 27;95(22):13296-300. doi: 10.1073/pnas.95.22.13296. Proc Natl Acad Sci U S A. 1998. PMID: 9789082 Free PMC article.
An empirical explanation of brightness.
Williams SM, McCoy AN, Purves D. Williams SM, et al. Proc Natl Acad Sci U S A. 1998 Oct 27;95(22):13301-6. doi: 10.1073/pnas.95.22.13301. Proc Natl Acad Sci U S A. 1998. PMID: 9789083 Free PMC article.
11,585 results
You have reached the last available page of results. Please see the User Guide for more information.