Psychological Monographs : General And Applied [microform] No.19/no.25
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At the beginning of the experimental work, a day of average brightness was selected and the adjustable rod so placed that its shadow cast on the screen by the lamp would be just perceptible. During all the following tests, the light in the room was regulated by two sets of curtains, so that this shadow would again be just perceptible. No experiments were made on cloudy days, which were too dark to allow such adjustment. Al- though this device is not extremely accurate, it is considerably more s...o than ordinary observation. The work of Froeberg^" shows that a change of 50 per cent, in the light will make a difference of only a few sigma in the reaction time, so that all variations in the reaction time due to great changes in the light intensity have been eliminated. Three methods of applying the stimulus to different parts of the retina suggest themselves. Probably the best method would be to provide a permanent fixation point for the eye in the center of the perimeter and to move the stimulus to the different eccentric posi- ' This time was found by a method devised by Erdmann and Dodge in 1899.
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