The facial expression of attention on the human face being induced by electrical currents. Guillaume-Benjamin-Amand Duchenne de Boulogne (September 17, 1806 - September 15, 1875) was a French neurologist who advanced the science of electrophysiology. Influenced by the beliefs of physiognomy, Duchenne wanted to determine how the muscles in the human face produce facial expressions which he believed to be directly linked to the soul of man.

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Duchenne, Human Physiognomy, Attention, 1862

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