It was the purpose of this study (1) to determine whether or not some of various types of feebleminded fall down differentially on any of the components of the tests more than on others, i.e., whether or not the hydrocephalics, for example, would run relatively high on verbal-meaning, whereas the mongoliana would run relatively high on space; and (2) to determine whether or not, considering the feebleminded group as a whole, there would be any significant differences in primary mental abilities .
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Ames, Dorice Elva. "Primary Mental Abilities of the Feebleminded." (1948). http://digitalrepository.unm.edu/psy_etds/151