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Commentary on Loring and Larrabee's Reanalysis of Reitan's Original Studies
19350 S. Dixie Highway, South Miami, Florida 33156, USA. ewr@bellsouth.net
Abstract:
The article by Loring and Larrabee (2006) 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.
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