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Related Experiment Videos

Comparability of WAIS--R Digit Symbol and the Symbol Digit Modalities Test

S F Morgan1, J Wheelock

  • 1Minneapolis Clinic of Neurology, Ltd., Minnesota, USA.

Perceptual and Motor Skills
|April 1, 1995
PubMed
Summary
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The Symbol Digit Modalities Test and WAIS-R Digit Symbol subtest show a strong correlation. However, the Symbol Digit Modalities Test yields significantly lower scores, impacting neuropsychological evaluations.

Area of Science:

  • Neuropsychology
  • Cognitive Assessment

Background:

  • The Symbol Digit Modalities Test (SDMT) and the Wechsler Adult Intelligence Scale-Revised (WAIS-R) Digit Symbol subtest are commonly used measures of processing speed.
  • Variations in scoring and standardization between these tests can influence interpretation in neuropsychological evaluations.

Purpose of the Study:

  • To compare scores obtained from the Symbol Digit Modalities Test and the WAIS-R Digit Symbol subtest in a clinical population.
  • To determine the extent of score discrepancies between the two measures.

Main Methods:

  • Administered both the Symbol Digit Modalities Test and the WAIS-R Digit Symbol subtest to 100 individuals undergoing neuropsychological evaluation.
  • Analyzed the correlation between the two tests and compared their standard scores.

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Main Results:

  • A high correlation (0.85) was observed between the Symbol Digit Modalities Test and the WAIS-R Digit Symbol subtest scores.
  • Standard scores from the Symbol Digit Modalities Test were significantly lower than those from the WAIS-R Digit Symbol subtest.
  • The mean score difference was equivalent to 2.5 to 3 WAIS-R age-scaled score points.

Conclusions:

  • While highly correlated, the Symbol Digit Modalities Test and WAIS-R Digit Symbol subtest are not interchangeable due to systematic score differences.
  • Clinicians should be aware of these discrepancies when interpreting neuropsychological evaluation results.
  • Further research may be warranted to explore the clinical implications of these score differences.