... example, the more we practise at tests of verbal aptitude, the more we increase ourability to understand the meaning of words and use them effectively; the more we practise at mathematics, the more ... him to the conclusion that the same peoplewho performed well in a variety of mental tasks tended to use a part of the brain that he termed g.Theg factor, therefore, laid the foundationfor the ... expressivespeech.Although the jury may still be out on the debate as to whether the g factor, as gauged by IQ tests, is just one single general intelligence,or whether there are, as Gardner and others suggest,...