Wikipedia
Introception
Charles Scott Sherrington originally introduced the term to neurophysiology to encompass just visceral sensations, but the term is later used to include the physiological condition of the entire body and the ability of visceral afferent information to reach awareness and affect behaviour, either directly or indirectly.
In nondual philosophy, Franklin Merrell-Wolff used "introception" to designate a mode of knowledge becoming available in a transcendent state of consciousness through identification with that which is known.