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Updated: Aug 6, 2025
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Assessment of Age-related Changes in Cognitive Functions Using EmoCogMeter, a Novel Tablet-computer Based Approach
Published on: February 14, 2014
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Cohort and Period Effects as Explanations for Declining Dementia Trends and Cognitive Aging
Sean A P Clouston1, Graciela Muñiz Terrera2, Joseph Lee Rodgers3
1Program in Public Health and Department of Family, Population, and Preventive Medicine, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA.
Population and Development Review
|March 20, 2023
Summary
Cognitive impairment incidence may be decreasing due to factors beyond aging. This study explores how childhood cognitive development and life stressors across generations may influence long-term brain health.
Area of Science:
- Neuroscience
- Gerontology
- Public Health
Background:
- Aging is the primary risk factor for dementia and cognitive decline.
- Despite aging, the age-adjusted incidence of dementia has decreased over recent decades.
- Aging alone does not account for observed changes in dementia incidence rates.
Purpose of the Study:
- To examine the roles of cohort and period effects on cognitive decline and dementia incidence.
- To investigate how generational differences (cohort effects) and life experiences (period effects) impact cognitive health over time.
- To propose a novel connection between childhood cognition and late-life cognitive functioning.
Main Methods:
- This is a position paper, synthesizing existing research and proposing new theoretical connections.
- It reviews demographic and cognitive function literature regarding cohort trends.
- It integrates findings on early/midlife stressors and their impact on cognitive dysfunction.
Main Results:
- Cohort effects in cognitive function have been observed since the early 1980s.
- Period effects, including socioeconomic factors and stressors, may contribute to reduced cognitive dysfunction.
- Childhood cognitive performance is a significant predictor of cognitive function in old age.
Conclusions:
- Observed decreases in dementia incidence may be linked to cohort and period effects, not just aging.
- Childhood cognitive development plays a crucial role in determining late-life cognitive health.
- Further research should connect childhood cognitive trajectories with later-life cognitive outcomes to understand dementia trends.
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