The present research intends to verify the effectiveness of a cognitive training (CT) to foster intelligence of school Brazilian children from different intellectual levels. Sixteen fourth-grade boys (M = 8.75 years; SD = .44) took part in this study and were randomly selected to the training group (TG) or control group (CG). In the pre and posttest, all children were assessed using measures with measures of fluid, crystallized intelligence, and school achievement. For the training program we used working memory task for a period of two months. Results: no statically significant difference was found between both groups at posttest in none of the measures used. However, after training, there was a reduction of the differences between GC and GF on measures of fluid intelligence. In the case of Raven, the difference between CG and GE (favorable to GC) dropped from d = .126 to .058. In the TNVRI test, the initial difference in favor of CG (d = .177) became negative (d = -.384), therefore in favor of GE. This small benefit was not observed in tests of school knowledge, where GC had the biggest gains in the post-test assessment. The results are partially supported in the literature. However, studies with a larger sample, more training sessions and longer interval between post-tests to verify the generality of these findings.
Cognitive training; fluid intelligence; crystallized intelligence
