The type I/type II perceptual dichotomy: a reanalysis for the illusions of extent.
The categorization of geometrical illusions of extent as Type I or Type II phenomena based on variation in magnitude with age is critically examined. Methodological shortcomings and the failure of contemporary findings to show matching age trends for components of a single illusion are presented as factors undermining the usefulness of this perceptual dichotomy. Finally, it is shown that a new Type I/Type II dichotomy based on changes in perceived size rather than amount of illusion indicates a developmental commonality among most of the illusions of extent.
Methodist College, Fayetteville, NC.
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Jaeger
D000293:Adolescent; D002648:Child; D002657:Child Development; D005556:Form Perception; D006801:Humans; D007088:Illusions; D009903:Optical Illusions; D010364:Pattern Recognition, Visual; D012858:Size Perception