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In the experiments on brightness enhancement it became necessary to place a dark field between the surround and the center. To accomplish this a field stop was mounted in front of the Maxwellian view lens. In these experiments the central flickering field was only about 1.25° in diameter; around it was a concentric dark annulus which had an outside diameter of 2° and around this was the 6° steady bright surround.
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In this latter case it was not possible for the observer to decide whether this light was "steady" or, in fact, pulsing at a rate above the CFF.
These experiments were begun in the spring of 1958, and have only recently been concluded. Not all of the subjects have been available for all experiments. In all 10, young adult males have served as subjects and the effects obtained were more or less consistently found for each subject tested.
Tabular results have been deposited as Document Number 6823 with the ADI Auxiliary Publications Project, Photoduplication Service, Library of Congress, Washington 25, D. C. A copy may be secured by citing the Document number and by remitting $1.25 for photoprints or $1.25 for 35-mm microfilm. Advanced payment is required. Make checks or money orders payable to: Chief, Photoduplication Service, Library of Congress.
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In the case illustrated this was true 38 times in the 40 repetitions. Only with a very low probability (P < 0.00006) could this have occurred by chance.
These cumulative measurement effects are emphasized in this kind of experiment, in which a number of successive measurements are made one after the other and plotted as a function of time.
Apparatus limitations required the surround to be held fixed at 25 ft-L for all luminance levels equal to or higher than this value, in this experiment.
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