The Hidden-figures Test (Cf-1) has been used to measure psychological differentiation among groups of Ss. This paper presents concurrent validity information derived from 12 studies which shows the existence of a median correlation of .51 between the Hidden-figures and either the Individual Embedded-figures Test, the Rod-and-frame Test or Witkin's Figure-drawing Scale. It is concluded that given the need to test large numbers of subjects at one time, the Hidden-figures Test appears to be a reasonably efficient and effective instrument.
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