1. Look up the name "Duchenne de Boulogne."
3. What was the year of the photograph. 1862
4. Why did he photograph his subject matter? A major neurologist, Duchenne de Boulogne introduced the use of electricity in physiological experimentations - authentic smiles formed by the mouth but also the eyes are since entitled ‘Duchenne smiles’ - and he also inaugurated the biopsy technique. The doctor became a photographer as well, as he meticulously recorded all the possible facial expressions of human beings.
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