The Wechsler Adult Intelligence Scale—Fourth Edition (WAIS-IV) is widely recognized as one of the most utilized intelligence tests for adults. While previous studies have examined the test’s structure using the Cattell–Horn–Carroll (CHC) model, individuals aged 70 and older have often been excluded due to the absence of supplemental subtests in their standardization sample. Niileksela, Reynolds, and Kaufman (2013) address this gap by presenting an alternative five-factor CHC model tailored for this age group.
Background
The WAIS-IV has historically been interpreted through various theoretical frameworks, with the CHC model being a prominent approach for organizing broad and narrow cognitive abilities. However, prior analyses of the CHC structure primarily focused on younger populations, leaving questions about its applicability to older adults unanswered. By focusing on individuals aged 70–90, the study offers a new perspective on how CHC abilities are measured in later life stages.
Key Insights
- Model Fit: The alternative five-factor CHC model demonstrates strong alignment with the data for individuals aged 70–90, indicating it captures key cognitive abilities effectively within this group.
- Measurement Invariance: The study shows that the model largely maintains measurement invariance across ages, with only minor variations in the Similarities subtest.
- Broader Applicability: The alternative model mirrors the five broad CHC abilities observed in younger populations, confirming its validity across the WAIS-IV age range.
Significance
This research expands the understanding of cognitive assessment in older adults by demonstrating that a CHC-based interpretation of the WAIS-IV can effectively apply to individuals aged 70 and above. By offering a model that requires only the core subtests, the study provides a practical framework for clinicians and researchers working with this population. It also underscores the importance of adapting established assessment tools to meet the needs of diverse age groups.
Future Directions
Future studies could benefit from exploring additional subtests or alternative models to further enhance the precision of cognitive assessments for older adults. Replicating this research across diverse cultural and clinical contexts may also improve its generalizability, ensuring the WAIS-IV continues to serve as a valuable tool for understanding cognitive abilities across the lifespan.
Conclusion
Niileksela, Reynolds, and Kaufman (2013) present an important contribution to the field of cognitive assessment by extending the CHC interpretation of the WAIS-IV to older adults. Their alternative five-factor model provides a robust and practical solution, ensuring that the test remains effective and meaningful for this age group while aligning with contemporary theoretical perspectives.
Reference
Niileksela, C. R., Reynolds, M. R., & Kaufman, A. S. (2013). An alternative Cattell–Horn–Carroll (CHC) factor structure of the WAIS-IV: Age invariance of an alternative model for ages 70–90. Psychological Assessment, 25(2), 391–404. https://doi.org/10.1037/a0031175
