Jean Pierre Flourens
Marie Jean Pierre Flourens (13 April 1794 – 6 December 1867), father of Gustave Flourens, was a French physiologist, the founder of experimental brain science and a pioneer in anesthesia. Through the study of ablations on animals, he was the first to prove that the mind was located in the brain, not the heart.
Mental image
The concept of "the mind's eye" first appeared in English in Chaucer's (c. 1387) Man of Law's Tale in his "Canterbury Tales", where he tells us that one of the three men dwelling in a castle was blind, and could only see with "the eyes of his mind"; namely, those eyes "with which all men see after they have become blind". The phrase remained rarely used and the OED incorrectly ascribes it to Shakespeare, as the first time the literally introspective phrase ‘the mind's eye’ is used in English was in Hamlet. As an example of introspection, it demonstrates that the internal life of the mind rarely came into focus in literature until the introspective realism movement in the 19th century.