Some studies focused on the distribution of scores have found that the Flynn effect mainly occurs with lower scores. However, Raven (2000) found that a lot of data must be re-interpreted with respect to the date of birth. Previously, this data had been interpreted to show that many abilities decrease when people get older. This data must now be interpreted to show that many abilities had in fact increased dramatically, as Flynn predicted. On many tests this occurs at all levels of ability. Two large samples of Spanish children were assessed with a 30-year gap. Comparison of the IQ distributions indicated that
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