Abstract: An important question in educational research is whether the imparting of knowledge and skills also improves pupils' intelligence. This aspect of transfer of learning is difficult to study within the framework of educational research. The longitudinal study presented here shows, based on sophisticated test materials and methods of analysis, that courses in Descriptive Geometry improve pupils' spatial ability, a primary dimension of intelligence. Also, sex differences that were clearly present at the first testing disappeared during "training" in Descriptive Geometry.
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