The book On After-Images .. was written by author Shepherd Ivory Franz Here you can read free online of On After-Images .. book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is On After-Images .. a good or bad book?
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F. B. Brandt this explanation is further confirmed. Using a stimulation of i sq. cm. of the northern sky fixated for 15 seconds at a distance of 30 cm., Dr. Brandt found that those boys who held the highest rank in school-work, those who had learned to fix their attention, could see the after-image for a longer time than those who were dull and inattentive. The attention in this case may have been largely influenced by ' interest,' but the general result and conclusions are the same. The ' brig...ht' boy is he who is interested in each novel experi- ence ; is he who attends with all his might to what is immediately present. During the course of the experiments this view was clearly indicated by a study of the actions of the subjects. A and B had been intellectual rivals throughout their school- work, and when B found that A was having after-images of longer duration than he, his interest flagged and it was difficult to persuade him to continue. While there are some variations in the relation between scholarship and the duration of the after- image, the results show that the three boys of excellent ability very easily outrank the other four.
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