Mécanisme de la physionomie humaine, ou, Analyse électro-physiologique de l'expression des passions
Mécanisme de la physionomie humaine is an 1862 Paris medical treatise by the neurologist G.-B. Duchenne, published by Renouard for physicians and students of physiology. Its pictures are sepia photographs of faces stimulated with electrodes, arranged in grids of oval frames with the expressions isolated one muscle at a time, which a designer might take as a model for systematic sequential portrait layouts and clinical study.
