- James Mill (1773 - 1836): James Mill maintained that all mental events consisted of sensations and ideas (copies of sensations) held together by association. No matter how complex an idea was, Mill felt that it could be reduced to simple ideas.
James Rowland Angell (1869-1949) was one of the past Presidents of American Psychological Association . As a President and Chairman of the Department of Psychology at the University of Chicago for 25 years, did much to promote Functionalism .
- Jean Lamarck (1744 - 1829): Jean Lamarck proposed that adaptive characteristics acquired during an organism's lifetime were inherited by that organism's offspring. This was the mechanism by which species were transformed.
Please see also Inheritance of acquired characteristics.
- Jean-Martin Charcot (1825 - 1893): Jean-Martin Charcot concluded that Hysteria was a real disorder, unlike most of the physicians of his day. He theorized the inherited predisposition toward Hysteria could become actualize