Developmental Patterns of Spatial Ability: An Early Sex Difference

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Abstract
Over 1,800 public school students (grades K-12, ages 6-18) took a battery of 7 spatial tests tailored to their respective developmental levels. Analyses of resulting data indicate (a) that it is feasible to measure spatial ability throughout this developmental range with modified versions of adult paper-and-pencil tests, (b) that a male advantage in spatial performance appears reliably by age 10, and (c) that the magnitude of the advantage remains constant through age 18. Analysis of covariance suggests that an early female prococity in language skills may mask a male advantage in spatial ability during the primary school years. There is no indication of a sex difference in kindergarten children.

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