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Abstract
The article by Loring and Larrabee (Citation2006) used effect size to compare Reitan's original Halstead Index (HI) data with Wechsler Bellevue Intelligence Scale (W-B) data. The results may be interpreted to support the concept that Halstead's concept of “biological” and “psychometric” intelligence was a form of “fluid” and “crystallized” intelligence. Except for three unused subtests, HI tests were fluid, while W-B performance tests were somewhat fluid and the W-B verbal tests were crystallized. Thus, the mean effect size of the normally used HI tests was almost twice that of W-B tests' mean size. The fluid nature of the HI tests provides their sensitivity to brain damage.
Notes
1The Russell Citation1980 study contains a rather critical error. It was stated in the abstract and text that verbal tests were more affected by brain damage, when less affected was correct.