Age Effects on Subtest and Composite Scores of the Wechsler Abbreviated Scale of Intelligence-Second Edition.
Level 4 - case-series / case-control
Cross-sectional analysis of a normative standardization dataset
PubMed 37902058 · doi:10.1177/10731911231207785
What was done
The authors evaluated age effects on individual subtest and composite index scores using the Wechsler Abbreviated Scale of Intelligence-Second Edition (WASI-II) standardization sample, extending prior research conducted on earlier Wechsler adult scales.
What was found
The abstract reports directional trajectories and peak age ranges without quantitative scores or effect sizes. Vocabulary showed minimal variation across age groups, and Similarities peaked at 30 to 54 years before declining. In contrast, Block Design peaked at 17 to 44 years then declined, and Matrix Reasoning peaked at 20 to 29 years and steadily deteriorated thereafter. The Verbal Comprehension Index peaked at 30 to 44 years with a maximum drop at 85 to 90 years, whereas the Perceptual Reasoning Index peaked at 20 to 29 years with marked decline by 65 to 69 years. Full Scale IQ remained average until age 65 years followed by decline, with minor trajectory variations across baseline Full Scale IQ levels.
Why it matters
These findings support fluid and crystallized intelligence models in the WASI-II, providing normative trajectory context for interpreting cognitive performance in clinical and research settings.
Limits
The abstract omits the sample size, demographic characteristics, and exact numerical test scores or effect sizes. Because this is a cross-sectional study of normative groups rather than a longitudinal follow-up, age differences may reflect cohort effects rather than true within-individual cognitive decline.
Cited by
- supports Fluid cognitive function peaks around age 25, whereas crystallized intelligence peaks in midlife around age 40 to 45.