The Influence of Training on the Level of Test Performance and the Factor Structure of Intelligence Tests

An attempt was made to study whether it is possible by specific training on one test to produce changes in the level of performance on similar tests and in the factor structure of a set of intelligence tests. Considerable improvement occurred in the level of performance on the test on which training was given, but no significant transfer effects to the performance on other tests were found. Slight differentiation was observed in the factor structure.