# The muscle of attention (left); Eyebrow contraction due to bright light (right)

- By: Guillaume-Benjamin-Amant Duchenne (de Boulogne) (French, 1806 - 1875)
- Date: 1854-1856, printed 1862
- Medium: albumen silver print
- Classification: Photograph
- Dimensions: image: 22.1 × 16.7 cm (8 11/16 × 6 9/16 in.) ; mount: 40.3 × 27.7 cm (15 7/8 × 10 7/8 in.)
- Culture: French
- Credit line: W. Bruce and Delaney H. Lundberg Fund, in Honor of the 25th Anniversary of Photography at the National Gallery of Art
- Museum: [National Gallery of Art](https://www.nga.gov/collection/art-object-page.169264.html)
- Rights: [Public domain (NGA Open Access, CC0)](https://creativecommons.org/publicdomain/zero/1.0/)
- Picture: https://api.nga.gov/iiif/24ba3032-e634-4ada-8ec0-6224d44d3cb4/full/!1920,1080/0/default.jpg
- Who can see it: Tweens profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)