Abstract
Wilhelm Erb and Carl Otto Westphal from Prussia first described the knee jerk in the same issue of the journal Archiv für Psychiatrie und Nervenkrankheiten in January 1875. This article retraces the history of development of 'deep tendon reflex' as an integral clinical sign during every neurological examination. The history of the evolving shapes of the reflex hammer, the iconic trademark and the ultimate signature of a neuroscientist, is also presented.
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