Abstract

An attempt is made to show that the brightness changes produced by a border can be measured by a compensation method in which the stimulus magnitude is reduced on one side of the border to such a value that the brightness inequality disappears. Experiments with rotating disks, similar to the color-mixing disks, were used to produce compensation for a specific luminance distribution with a border. The compensation method can be used to compare the lateral inhibition produced by Mach-band patterns with that which accompanies border effects. Also, comparisons are made of the similarities and differences of lateral inhibition produced by the two methods. The influence of the border has the advantage that sharp projection of the image on the retina is not necessary, as in Mach bands. The difference between the Mach bands and the border effect is discussed and used to explain why the compensation for the border effect changes with the distance of the observer.

© 1972 Optical Society of America

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