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IQ: R.I.P.

M D Lezak1

  • 1Department of Neurology, Oregon Health Sciences University, Portland 97201.

Journal of Clinical and Experimental Neuropsychology
|June 1, 1988
PubMed
Summary

The 70-year-old intelligence quotient (IQ) concept is outdated for neuropsychological practice. Neuropsychology requires new methods to accurately assess cognitive functioning beyond the limitations of IQ scores.

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Area of Science:

  • Neuropsychology
  • Psychometrics
  • Cognitive Science

Background:

  • The intelligence quotient (IQ) gained prominence in early 20th-century psychology for its perceived metrical respectability and public appeal.
  • Despite challenges from factor analysis, social scientists, legal rulings, and neuroscience, the IQ concept has persisted in popular testing.

Observation:

  • The application of IQ scores in neuropsychological practice can obscure or misrepresent an individual's specific cognitive strengths and weaknesses.
  • Aggregated scores from diverse tests of brain function and mental abilities may not accurately reflect a person's neuropsychological status.

Findings:

  • The traditional IQ concept, established over 70 years ago, is argued to have outlived its scientific utility.
  • Current neuropsychological assessment practices relying on IQ may provide a generalized or inaccurate picture of cognitive abilities.

Implications:

  • Neuropsychology must move beyond the IQ framework to develop and adopt more nuanced and accurate methods for evaluating mental functioning.
  • Exploring alternative conceptualizations and assessment tools is crucial for advancing the field and providing better patient care.

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