The use of IRT to investigate the relationships between the g factor and cognitive tasks

Many authors have looked for the relations between the g factor and cogniti ve tasks in order to find out the nurture of the g factor (Jensen, 1998). N evertheless, some methodological problems must be solved to understand if t he individual differences in g are differences in cognitive processes. One of them is the low reliability of the scores in this kind of tasks. On the grounds of the standard error of the ability level estimation, we hypothesi zed that the correlations between the g factor and a working memory task wo uld be larger in the group of the subjects better measured (less standard e rror). The results support this hypothesis.