Dr Duchenne, a native of Boulogne (1806-1875) was a pioneer in neurology.
He described progressive muscular dystrophy called after him "Duchenne's myopathy" (1849)
and later studied the effects of the electric current on facial muscles in order to cure them.
In his "photographic atlas (1862), he brought together various photograhs taken
to study the connection between (mostly facial) muscles and the expression of feelings.