Verbal Intelligence: a key to basic skills?

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Abstract
Intra‐individual variability of cognitive measures, such as verbal and spatial ability tests, has frequently been reported to typify learning disabled children. To test the generality of such findings, longitudinal data from a large representative and non‐clinical sample of Swedish children (n = 812) were analysed. At age 10, the children were tested with a Swedish intelligence scale. At age 13, basic academic skills were measured by standardised achievement tests. Typical cognitive profile types, based on the verbal and spatial intelligence subtests, were identified through cluster analyses (CLUSTAN) of the girl and boy samples separately. The satisfactory solution arrived at was a five‐cluster representation for the girls (n = 497) and an eight‐cluster representation for the boys (n = 497). For both sexes, verbally as well as spatially oriented profiles emerged. However, the verbal orientation was more pronounced for girls, whereas the boys displayed greater variability and stronger spatial orientation. General intelligence at age 10 was a strong predictor for basic skills at age 13 (r > 0.70). Verbally strong children tended to achieve better than predicted by their overall level of intelligence, whereas spatially oriented children showed a less favourable development in basic academic skills. The results are discussed in relation to neuropsychologically‐based models of reading disability and theories of language and development.