G. Canby Robinson (1878-1960) and George Draper (1880-1959), young physicians affiliated with the Rockefeller Institute for Medical Research in New York, used an early electrocardiograph to study the action of the vagus nerve on the human heart. This tracing represents their work.
Ref: G. C. Robinson and G. Draper, “Effect of Mechanical Stimulation of the Vagus Nerve,” Journal of Experimental Medicine 14 (1911): 217.
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