. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. Fig. 4 Two diagrams by Freud (8, 8b), presenting the mental apparatus as though spatially stratified. In a letter to Fleiss in 1896, Freud (1954) discussed a revision of his Project for a Scientific Psychology and referred to his 'latest bit of specula- tion, the assumption that our psychical mechanism has come about by a process of stratification'. A quarter of a century later, Freud made two attempts to diagram these ideas, with interesting differences in the form of the figures. The first (Fig. 4, left)
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. Fig. 4 Two diagrams by Freud (8, 8b), presenting the mental apparatus as though spatially stratified. In a letter to Fleiss in 1896, Freud (1954) discussed a revision of his Project for a Scientific Psychology and referred to his 'latest bit of specula- tion, the assumption that our psychical mechanism has come about by a process of stratification'. A quarter of a century later, Freud made two attempts to diagram these ideas, with interesting differences in the form of the figures. The first (Fig. 4, left), prepared in 1923, resembled an inverted brain, although reference was made to it as an ovum. The second (Fig. 4, right), prepared a decade later, was on the other hand really egg-shaped. In his lecture on 'The Anatomy of the Mental Personality', Freud (1933) elaborated upon the contents of these figures: 'Superego, ego and id are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Council for International Organizations of Medical Sciences; Fessard, A. (Alfred); Delafresnaye, J. F. (Jean Francisque), 1919-. Springfield, Ill. , Thomas
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