Abstract
29 pairs of 9 to 11-yr.-old MZ twins (11 male, 18 female) who were discordant on the magnitude of their susceptibility to the Ponzo illusion were given the Children's Personality Questionnaire (CPQ). The Wilcoxon matched-pair signed-ranks test was used to determine whether the twins with relatively larger magnitudes of the Ponzo illusion than their co-twins also manifested systematic differences on CPQ factor scores. Among males, twins with larger magnitudes of the illusion were relatively more calm and stable (Factor C), conscientious (Factor G), critical, restrained and evaluative (Factor J); among females the twins with larger magnitudes of the illusion were more calm and stable (Factor C), more shrewd (Factor N), and less apprehensive and anxious (Factor O) than their co-twins. Results are discussed in terms of Piaget's theory of children's deployment of attention and Kagan's reflective-impulsive dimension in children's cognitive judgments.
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