1This study had as its purpose the validational testing of an observation of Urbantschitsch; namely, that a visual stimulus rendered invisible by covering it with sheets of paper still registered through the paper upon the perceptual apparatus. Methodology was based upon the possible recovery of transformations of this stimulus through the images of a group of subjects. Experimental controls, an a priori system of quantification, statistical applications, and "blind" scorers were part of the experimental design. The results supported this hypothesis of Urbantschitsch to a significant degree.

2A subsidiary hypothesis, that the use of an "ego-impairing" drug (LSD-25) in subhallucinatory doses would increase the degree of delivery of percepts into subsequent imagery, was also tested and confirmed. The research techniques for this corollary experiment were the same as for the main study and used part of its research sample.