Toward an explanation of Dodrill's observation: high neuropsychological test performance does not accompany high IQs.
Dodrill demonstrated that many neuropsychological tests correlate poorly with intelligence in the above-average intelligence range, while correlating adequately throughout the total range. The most parsimonious explanation for this observation is that most neuropsychological tests have a low ceiling with a constricted range at their upper limits precluding the possibility of high correlations. This explanation is examined through various examples. Interpretation should take this constricted range into consideration for people with above-average premorbid ability, by supplementing neuropsychological tests with intellectual ability tests. Also, the future construction of neuropsychological tests should extend the upper range.
Russell
E W
EW
f@bellsouth.net
D000328:Adult; D006801:Humans; D007360:Intelligence; D009483:Neuropsychological Tests; D015203:Reproducibility of Results