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Molly R LaPoint1, L Paloma Rojas-Saunero2, Hilary L Colbeth3
1Kaiser Permanente Northern California Division of Research, Pleasanton, CA, USA.
Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 23, 2025
Summary
Occupational complexity involving tasks with "things" was linked to smaller brain volumes in older adults. Conversely, complexity with "people" showed a positive association with occipital lobe volume, suggesting varied impacts on brain health.
Area of Science:
- Neuroscience
- Gerontology
- Occupational Health
Background:
- Occupational complexity (OC) is recognized for its association with cognitive health in older adults.
- However, the specific links between different domains of OC (people, data, things) and brain structure remain largely unexplored.
Purpose of the Study:
- To investigate the association between specific domains of occupational complexity and brain imaging markers in older adults.
- To determine if different facets of lifetime work experience relate to brain structure variations.
Main Methods:
- Analysis of brain MRI data (cortical gray matter, hippocampus, lobe volumes) from 357 Kaiser Healthy Aging and Diverse Life Experiences (KHANDLE) study participants.
- Occupational complexity scores for 'people,' 'data,' and 'things' were derived from participants' main lifetime occupation using the 1970 US Census Dictionary of Occupational Titles.
- Linear regression models were used to assess the associations between OC domains and brain imaging markers, adjusting for demographic and socioeconomic factors.
Main Results:
- Higher occupational complexity involving 'things' was inversely associated with volumes in the parietal, occipital, and temporal lobes.
- Higher occupational complexity involving 'people' showed a positive association with occipital lobe volume.
- No significant associations were found between occupational complexity involving 'data' and any brain region volumes.
Conclusions:
- The nature of occupational complexity, specifically the focus on 'things' versus 'people,' appears to have differential associations with brain structure in older adults.
- 'Things'-oriented work complexity was linked to reduced volumes in several brain regions, while 'people'-oriented complexity was associated with increased occipital lobe volume.
- Further research with larger, longitudinal datasets is recommended to confirm these findings and elucidate the long-term impact of occupational complexity on brain health across the lifespan.
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