United States or Barbados ? Vote for the TOP Country of the Week !
His idea seems to be that Davidson, stooping between the poles of the big electro-magnet, had some extraordinary twist given to his retinal elements through the sudden change in the field of force due to the lightning. He thinks, as a consequence of this, that it may be possible to live visually in one part of the world, while one lives bodily in another.
On the other hand, an illusory attribution of colour would imply that there is no corresponding physical agency at work in the case, but that the sensation is connected with exceptional individual conditions, as, for example, altered retinal sensibility. We are now, perhaps, in a position to frame a rough definition of an illusion of perception as popularly understood.
Wheatstone, a long time ago, arranged his stereoscope so that a negative correlation obtained between the degree of convergence and size of the retinal image. Philosophical Transactions, 1852. Very interesting is the fact that Stratton demonstrated by artificial means what was naturally the case in that of the boy reported in the Annals referred to above.
Atrophy and cystic degeneration of the nerve trunk follows destruction of retinal neurons and cupping of the disc. Neuroglia remains in part. Connective tissue elements increase in the optic nerve as the nerve fibers disappear. Glaucomatous Ring.
"I don't know whether or not to be glad that you have no curiosity about your own case," he said presently. "That only shows you how helpless I am. I have no choice. I have lost my own identity." "Didn't your doctor back in Cleveland tell you anything about what was wrong with your eyes?" "He said at first it was retinal; then he said it was iritis. He didn't like to answer any questions."
When the book is held at arm's length, both cross and round spot will be visible; but if the book be brought to about 8 inches from the eye, the gaze being kept steadily upon the cross, the round spot will at first disappear, but as the book, is brought still nearer both cross and round spot will again be seen. Experiment 180. To illustrate the duration of retinal impressions.
Hence we tend, under certain circumstances, to carry over the retinal result of the movement, that is to say, the impression produced by a shifting of the parts of the retinal image to new nervous elements, to the object itself, and so to transform a "subjective" into an "objective" movement.
It imitates, by means of two flat drawings, the dissimilar retinal pictures projected by a single solid receding object, and the lenses through which the eyes look are so constructed as to compel them to converge as though looking on a single object.
I believe that if it were possible to take a retinal print which it someday will be you would have a perfect picture of what it was I saw, Beyond doubt it was a lamellicorn, one of the copridae. With the one exception of its monstrous size, there were the characteristics in plain view; the convex body, the large head, the projecting clypeus.
But however this be, this disposition would seem to have been largely promoted by the fact that, throughout my experience, the stimulation of any retinal point has been connected with that of adjoining points, either simultaneously by some second object, or successively by the same object as the eye moves over it, or as the object itself moves across the field of vision.
Word Of The Day