title: Subjective criteria and illusions in visual testing: some methodological limitations.
abstract: It is argued that illusions cannot generally be investigated with criterion-independent methods. This limits the value of the data obtained from them. This is particularly important when the results are compared between groups of subjects, for example, between dyslexic readers and controls, since it is possible that the differences between the groups reflect differences with regard to criteria rather than real perceptual differences.
authors: , Ullevaalsalleen 4C, 0852, Oslo, Norway, berntskottun@yahoo.com.
authors: Bernt C
authors: BC
authors: Skottun
authors: John R
authors: JR
authors: Skoyles
mesh_terms: D006801:Humans; D007088:Illusions / Q000502:physiology*; D009483:Neuropsychological Tests / Q000592:standards*
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