Nikolai Vvedensky

Nikolai Evgenievich Vvedensky (Russian: Николай Евгеньевич Введенский; 28 April 1852 - 16 September 1922) was a physiologist who came up with a theory of parabiosis which examined the phenomenon of anaesthesia and was among the first to use electrical sensors to study nerve activity and physiology.

He joined St Petersburg University to study law in 1872 but quickly transferred to the natural sciences.

In 1874 he was arrested for revolutionary activities and after three years in prison he graduated in 1879 and studied physiology with I. M. Sechenow, receiving a master's degree in 1884 after which he spent time in Germany, Austria and Switzerland.

He examined how nerve impulses caused a prolonged contraction of attached muscles.

He introduced the idea of parabiosis or the reduction of normal excitation by the application of repeated stimuli.