When the perception of an uncomplicated tactual or visual sensation is retained in consciousness for a long time, certain definite changes in this perception are observed. Similarly, when an imagined sensation is retained in the same manner, changes also occur. By studying the development and fate of these changes in the visual and tactual after-effects or imaginations, insight can be obtained into the structure and determinants of perception.
In the sphere of visual phenomena a careful investigation was made by Kanner and Schilder1 of the movements in the representation of optic images and the representation of optic images imagined to be in movement. They have described the results for the images of both quiet, inanimate objects and those in natural movement. They found many tendencies toward movement chiefly of a waving character, scintillation of images, multiplication, changes in size and shape, disintegration and fragmentation of lines, fading and diffusion
BROMBERG W. TACTUAL PERCEPTION IN ALCOHOLISM: STUDY OF THE INFLUENCE OF ALCOHOLIC AND OF OTHER PSYCHOTIC STATES ON TACTUAL AFTER-EFFECTS. Arch NeurPsych. 1932;28(1):37–51. doi:10.1001/archneurpsyc.1932.02240010045003
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