Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 12, 2025
In order to understand this we must go back to what we learnt in the course of our optical studies as to the two forms of vision arising from the activity of the eye's inner light the dream-vision and the seeing of after-images.
With the after-images it is different. Although to begin with they are present in our consciousness with a clarity no greater than that of the dream-pictures, nevertheless we are able so to enhance our consciousness of them as to bring them under observation like any external phenomenon.
All vision, physiologically considered, is of the nature of dream vision; that is to say, we owe our day-waking sight to the fact that we are able to encounter the pictures of the outer world, brought to us by the light, with a dreaming of the corresponding after-images.
He, therefore, traced the interchange of light-values in colourless after-images to a 'silent resistance which every vital principle is forced to exhibit when some definite condition is presented to it. Thus, inhalation presupposes exhalation; thus every systole, its diastole.
What we first need, however, is a closer insight into the physiological process in the eye which causes the after-images as such. Wherever Goethe speaks of a simple activity of the retina, we are in fact concerned with a co-operation of the retina with other parts of our organ of sight.
If the world were less than this, if the percept could not somehow become a concept, all progress would come to a standstill, and we should be no more than creatures of sensations and percepts which vanished as soon as they appeared. But these do not vanish; they persist in various ways, as after-images, concepts, memory.
It is the activity of the eye itself, working in a dreamlike way from its blood-vessel system, and coming to our consciousness by this means. Here again, just as in the simple opposition of light and dark, the perception of coloured after-images is connected with a breaking-down process in the nerve region of the eye, and a corresponding building-up activity coming from the blood.
Word Of The Day
Others Looking