Failures in executive function, which governs impulses, task management, and working memory, may be an early indicator of Alzheimer's disease, appearing as much as 14 years before a formal diagnosis. Dr. Adrian Owen, a neuroscientist with over 35 years of experience, explains that these cognitive deficits can manifest as difficulties with planning, managing finances, or juggling multiple tasks.
Owen's research, involving assessments of nearly 20 million volunteers through the digital platform Creyos, highlights the crucial role of executive function in decision-making. While these impairments are known to occur after strokes, cardiac arrests, and brain injuries, their connection to Alzheimer's is increasingly evident.
Impairments in working memory, for example, have been reported in the earliest stages of Alzheimer's. Research published in 2016 in the journal Alzheimer's & Dementia indicated that cognitive deficits unrelated to long-term memory can precede a diagnosis by over a decade. Early detection is vital, as many promising Alzheimer's drug trials suggest that intervention is most effective when initiated early to slow disease progression.
Simple mental strategies and training may help improve working memory and temporarily slow cognitive decline in individuals with mild Alzheimer's disease. A 2017 study in the British Journal of Psychiatry demonstrated that patients trained in a "chunking" method, which breaks down information into smaller parts, showed significant improvement in remembering sequences with structure, unlike a control group.
Another technique, the "memory palace," leverages spatial navigation abilities to associate information with familiar locations. This method, which involves mentally navigating a known environment, can aid in recalling information in a specific order.
Turning facts into stories, even absurd ones, can also strengthen memory by anchoring new information to existing neural pathways. This approach reduces mental load and creates more robust memory cues.
Failures in inhibitory control, or willpower, are also linked to dementia. A test called "Double Trouble," where individuals must name the color of a word that is also a color name (e.g., saying "blue" when the word "red" is written in blue ink), has shown potential in identifying dementia-like cognitive impairment. In 2023, an algorithm developed by Owen's lab using this test accurately identified dementia patients over 80% of the time, suggesting early failures in inhibitory control may predict future onset.
Owen emphasizes the importance of accurately identifying individuals who will not develop Alzheimer's, as treatments can have significant costs and side effects. Simple, inexpensive online tests of executive function could offer a scalable solution for early detection, complementing more complex diagnostic methods.
Beyond Alzheimer's, maintaining executive function involves lifestyle choices. Regular aerobic exercise enhances frontal lobe function and planning ability by increasing blood flow to the brain. Consistent sleep schedules are crucial, as deprivation disrupts the prefrontal cortex responsible for planning and can lead to emotional dysregulation.
Managing stress through techniques like mindfulness and regular breaks is essential for cognitive performance. Even hunger can impact executive function, potentially leading to impulsive behavior as the brain conserves glucose for vital functions. Certain foods, such as those rich in flavonoids like grapes and blueberries, have shown potential to improve attention, working memory, and planning.
Moderate coffee consumption has also been linked to improvements in executive functions like planning and task-switching. However, Owen suggests that one of the simplest and most effective strategies for bolstering memory and planning is to write a list, which helps organize thoughts and reduce cognitive load.