But a cultural factor is suspected as operative here, because boys do no better than girls in the preschool years on such tests, and it seems obvious that they depend upon the special kind of information that helps them in these tests and that is not culturally offered to or encouraged in girls. Furthermore, boys do much better in these tests than they do in the more abstract tests of spatial relations, upon which both sexes may be equally uninformed.
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Boys are found to do better than girls on block counting from pictures, directional orientation, plan of search, tests of form boards, puzzle boxes, assembling objects, pencil-and-paper mazes, mechanical comprehension, arithmetic problems and arithmetic reasoning, ingenuity, and induction.
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On the Army Alpha tests boys excel significantly in only three tests: arithmetic reasoning, number-series completion, and information. In arithmetic computation girls do better than boys, but they do not do as well as boys in solving arithmetic problems and in arithmetic reasoning.
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As far as intelligence scores and other indications of what we call intelligence go, the conclusion is clear: Girls, on the whole, do better than boys on whatever it is that the intelligence tests and other tests "measure." The only things in which boys do better than girls are mathematics, arithmetical reasoning, and mechanical and spatial aptitudes; and the evidence indicates that cultural factors play a significant role in assisting boys to make a better showing in these areas of knowledgefor it is largely upon knowledge that, it is suspected, the superior achievement of boys, on the average, is based. That this is so is indicated by the girls' increasingly doing as well as boys on those tests in which boys ritually excelled.
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It is well established that females start developing in utero at a more rapid rate than males and that this acceleration in the rate of growth is maintained by the female throughout childhood and up to the age of seventeen and a half years. It has been suggested that the acceleration in physical growth in girls is also accompanied by an intellectual acceleration, in which case boys and girls of the same chronological age cannot be compared with one another. It would be necessary to make the comparison on the basis of psychological or developmental age rather than chronological age. But such a procedure would seriously distort
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