The purpose of this study is to clarify further the relationships among creative, cognitive, and affective production of students. Thirteen pairs of twins, eight monozygotic (MZ), five dyzygotic (DZ), were administered the Torrance Tests of Creative Thinking, MMPI, and Revised Beta Examination. The F ratio for testing significance of within-set…

THE PRIMARY PURPOSE OF THIS STUDY WAS TO TEST THE HYPOTHESIS OF DIFFERENTIAL HERITABILITY RATIOS FOR WHITE AND NEGRO CHILDREN ON TESTS OF SPATIAL ABILITY. IN A TABLE THE TWO GROUPS ARE COMPARED ON EIGHT SPATIAL ABILITY TESTS BY FOUR DIFFERENT HERITABILITY ESTIMATES. IT IS CLEAR FROM THE TABLE THAT ONLY THE OBJECT APERATURE TEST YIELDS CONSISTENTLY…

The estimation of genetic models reported by J. L. Jinks and L. J. Eaves in a recent review are critically examined. A number of errors in procedure and interpretation are found. It is concluded that the evidence, provided by kinship correlations, for the proposition that intelligence is highly heritable, is not persuasive. (Author/BJG)