It is only necessary to close one’s eyes, then grimace and move one’s limbs to become conscious of these secondary images which picture each movement of the features, etc. Footnote 93: The mechanism is probably not quite so simple as this, probably past visual perceptions of self and the environment took part, so that the vision was a fusion or composite of these older primary images and the secondary images. The principle of mechanism, however, would not be affected by this added element. Sidis (The Doctrine of Primary and Secondary Sensory Elements, _Psych. Rev._, January-March, 1908) has maintained that all hallucinations are the emerging of the secondary images of previous perceptions. If, on the other hand, the vision be interpreted as something fabricated by the subconscious process—as must be the case with some hallucinations—then this process must have been much more complicated than memory. Something akin at least to constructive imagination and intelligence that translated the experiences into visual terms. Footnote 94: That is to say, as described by the visualizer. Footnote 95: Cf. The Dissociation, pp. 211-220. Footnote 96: At this point the subject watching the vision remarked, “I drop one of the letters, but I do not know I have done so.” In other words, conscious of the content of the somnambulist’s consciousness, the visualizer knows that there is no awareness of this act. The letter was afterward found by the servant on the stairs. Footnote 97: Coconscious ideas may provoke hallucinations. (For examples consult “Hallucinations” in Index to The Dissociation.) LECTURE VII SUBCONSCIOUS INTELLIGENCE (Continued) III. _Subconscious intelligence underlying spontaneous hallucinations._—Spontaneous hallucinations often offer opportunities to study subconscious processes exhibiting constructive intelligence. Although properly belonging to clinical phenomena, they often can be so clearly related to an antecedent experience as to allow us to determine the causal factor with the same exactness as in the experimental type, and, therefore, to infer the connecting subconscious link with equal probability. Some of these spontaneous visions indicate that the subconscious link must be of considerable complexity and equivalent to logical processes of reasoning, volition, and purposive intelligence. Sometimes the same subconscious processes which fabricate the vision determine also other processes of conscious thought and movements. In illustration I may cite an incident in the life of Miss B., which I have previously described: