抄録
When one sensory stimulus is given to a subject in a drowsy state, images of other objects associated with it often appear. These images sometimes have forms and calours, and sometimes are devoid of forms, only lights and colours being present. This phenomenon resembles the experience of colour-hearing, and is supposed by Bachen to be a new type of synaesthesia. As these images disappear when they are observed attentively, a passive attitude is necessary. The character of images of this kind is such that elements of forms and colours of various objects have been disjointed and connect with each other in different ralationships which construct new images. These images appear easily with strong stimuli.
The images of this sort can also be experimentally aroused by post-hypnotic suggestion. After we experimented on a lot of subjects, it was confirmed that a situation like the one stated above was also true in post-hypnotic hallucinations. Namely, stimulus figures were broken into elements, and each appeared as a distinct image. And when two recalling stimuli were given at the same time the images corresponding with each stimulus overlapped. (Fig 3. A. in Japanese text). In the latter case, if one stimulus was strengthened only the image correspsnding with it increased in intensity. When the distance of each stimulus being varied or the position changed up and down, the distance and the position of the images were accordingly changed. Thus by changing the conditions of the stimuli, visual images of various characters and forms could be aroused at will.
Based on the observed facts stated adove, we set up the integration theory of the mind. In the cerebral cortex we assume an image center, pathways between each image center and a unifying synergic center, which are formed through integration. When the activity of the unifying synergic center is weakend, lower centers become active and the appearence of images becomes more frequent. Thus, the phenomena mentioned above can be explained on the psycho-physiological basis.
