Emma A. Rodrigues, Simon Fraser University
August 26, 2024
As the global population ages, understanding the variability in cognitive aging becomes increasingly important. Why do some individuals remain cognitively sharp while others experience significant decline?
This question has been central to my doctoral research. Recent studies introduce the “orchid and dandelion” phenomenon to cognitive aging, suggesting that some people, like orchids, are highly sensitive to their environment, thriving or deteriorating based on external conditions. Others, like dandelions, show resilience and maintain cognitive performance regardless of their surroundings.
This framework could reshape our approach to cognitive health interventions in older adults, leading to more personalized and effective strategies to mitigate cognitive decline.
The orchid and dandelion phenomenon
The orchid and dandelion metaphor was introduced in the field of developmental psychology and describes how individuals differ in their sensitivity to environmental conditions.
“Orchids” represent individuals who are strongly affected by their surroundings, thriving in optimal environments but struggling in less supportive ones. In contrast, “dandelions” represent resilient individuals who are able to maintain their health regardless of external conditions.
Our research has explored the differences in the interaction between environmental factors and cognitive performance in older adults. Results suggest that some individuals — cognitive “orchids” — are more susceptible to environmental influences on cognitive health. Cognitive “dandelions,” while resistant to environmental detriments, also do not benefit as much from supportive environments.
Real world impact of lifestyle choices on health
The orchid and dandelion framework provides a new perspective on why lifestyle choices do not always predict health outcomes.
Consider individuals who engage in unhealthy behaviours such as smoking, a sedentary lifestyle, social isolation or other detrimental environments. Surprisingly, some of these people live long, cognitively (relatively) healthy lives, possibly due to their “dandelion” resilience.
On the other hand, others who follow healthy habits — exercising regularly, eating well, avoiding harmful substances — may still experience cognitive decline, reflecting the vulnerability of cognitive “orchids.”
For instance, an “orchid” might experience significant decline after a stressful life event, but in an enriched, supportive environment, they could outperform a “dandelion” who remains cognitively stable in most conditions. These examples highlight the limitations of a one-size-fits-all approach to health, and show the need for personalized interventions.
Cognitive health interventions
Research suggests that there is an ongoing debate regarding the efficacy of interventions aimed at promoting good cognitive health in older people. Exploring the cognitive aging process through this lens could have significant implications for designing the interventions needed to support older adults’ cognitive health.
For cognitive “orchids,” targeted strategies such as promoting physical activity, cognitive training or social engagement could be beneficial. On the other hand, cognitive “dandelions” may benefit more from general health maintenance strategies.
By recognizing these individual differences, health-care providers can develop more effective, personalized approaches to cognitive health, potentially improving cognitive outcomes for older adults.
Implications for an aging world
Given the global trend toward an aging population, our research team’s findings are timely. As the population lives longer, the prevalence of cognitive decline and dementia is expected to rise, posing challenges for individuals, families and health-care systems.
The current approach to cognitive health, which often treats everyone the same, may not be sufficient to address the complexities of cognitive aging. By adopting a more detailed understanding of how cognitive health varies among individuals, we can develop interventions that are better suited to each person’s needs.
In child development, it’s estimated that 15 to 20 per cent of children experience over half of the recorded cognitive illnesses. These children likely represent “orchid” individuals in detrimental environments.
While it remains unclear whether this significant proportion carries into older ages, and what the long-term impact may be, recognizing and addressing the specific needs of these individuals is crucial. By identifying “dandelions” who are more resilient to negative changes and focusing early interventions, such as personalized social prescribing, on “orchids,” we could potentially mitigate cognitive decline.
This approach may not only improve individual health outcomes, but also lead to meaningful savings in health-related costs, making it a vital consideration in public health planning.
The orchid and dandelion phenomenon offers a new framework for understanding the diverse experiences of cognitive aging. By recognizing the unique environmental sensitivity individuals may experience, we can develop interventions that more effectively support cognitive health in older adults.
More research is needed to better understand the implications of these findings, but this personalized approach could be key to helping more people maintain cognitive function and quality of life in their later years.
Emma A. Rodrigues, PhD Candidate in Computational Neuroscience, Simon Fraser University
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This article is republished from The Conversation under a Creative Commons license. Read the original article.