Employing 14 sets of anisekonic lenses of ascending power in the psychophysical method of limits, the distortion thresholds for an apparently mutilated figure and for a normal figure were established for a sample of 12 S's. The results show the threshold for the mutilated figure to be significantly higher than for the normal This indicates that a greater amount of optical change is required to bring about a concomitant perceptual change for the mutilated as compared with the normal figure. (PsycINFO Database Record (c) 2006 APA, all rights reserved)
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Wittreich et al. (1955) studied this question.
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