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We have identified a class of stimuli which seem to tap into the basic human ability to identify and name shapes. Using computer-generated stimuli, we found that patterns with low fractal dimension contours evoked the perception of namable objects, and that this proportion is increased when a preattentive criterion for examining the patterns is used. Furthermore, this result holds whether the patterns are filled in shapes (e.g., cloud patterns) or simple edge contours.
Rogowitz et al. (Mon,) studied this question.