Guillaume-Amant Duchenne de Boulogne, "Plate 31: Excitation électrique un peu plus forte des grand zygomatiques: Rire faux," from "Ch. 6: Muscles de la joie et de la bien veillance," in Icono Photographique: Mécanisme de la Physionomie Humaine, before 1857 (negative), published 1862, albumen print.

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Keywords: boulogne, de, duchenne, guillaume-amant