Evidence-Based Reviews

Helping older adults overcome the challenges of technology

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References

The Box10-22 describes some of the effects of aging on the brain, and how these changes are reflected in cognitive abilities.

Box

The aging brain’s effects on cognitive function

The global baseline intensity of human brain activity, determined by indirectly measuring blood oxygenation, decreases with age.10 Multiple domains of fluid cognition decline with age; these cognitive abilities include processing speed,11,12 working memory,11 episodic memory,11 and executive function.11 Expected neuroanatomic changes of aging include a decrease in cerebral grey matter volume as well as decreased white matter integrity, which is associated with diminished executive function and impaired working memory.13 Processing speed is associated with increased white matter microstructure during neurodevelopment.14 Diminished processing speed in older adults also may predict increased mortality risk.15 Individuals with advanced age may have augmented difficulty with episodic memory, especially when they are required to integrate information from more than one source.11 Diminished hippocampal volume13 and reduced activity of the middle frontal gyrus are associated with age-related decline in episodic memory retrieval.10 Working memory16 is known to share a neurocircuitry overlap with attention processes.17 Working memory capacity also is closely associated with other cognitive functions, such as shifting and inhibition.10 Enhanced cerebellar activity is related to working memory; increased cerebellar activity is likely due to compensatory recruitment of neurons due to reduced activity in the superior frontal gyrus.10 The superior frontal gyrus contributes to both working memory as well as executive processing.10

Although the cognitive decline associated with aging is inevitable, individuals who experience cognitive decline at an increased rate are predisposed to worse outcomes. One longitudinal cohort study found that adults in their 8th and 9th decades of life with preserved cognitive function had a lower risk of disability and death.18

On the other hand, crystallized cognitive functions such as semantic memory,13 shortterm memory,13 and emotion regulation16 remain largely intact throughout the aging process. Semantic memory, a subtype of episodic memory, is related to associated facts or interpretations of previous occurrences.19 This type of memory is detached from an individual’s personal experience.20 Semantic memory loss classically presents with anomia and detectable lesions in the anterior and temporal lobes.20 Emotion regulation deficits are not a part of normal aging; in fact, emotional well-being is known to either improve or remain consistent with age.21 Emotional experiences in patients of advanced age may be more complex and unique in comparison to other cognitive abilities.22

The role of cognitive training

Existing interventions for helping older adults improve their technology proficiency generally focus on improving cognition, and not necessarily on addressing skills learning. Skills learning and cognition are related; however, the brain depends on neural plasticity for skills learning, whereas cognitive declines are a result of gradual and functional worsening of memory, processing speed, executive functioning, and attention.23 Interventions such as cognitive strategy training are capable of altering brain neurocircuitry to improve attention and memory.10,11 Other interventions known to improve cognition include exercise10 and processing speed training.24 On the other hand, skills learning is more effectively targeted by interventions that focus on stimulating realistic environments to mimic activities of daily living that involve technology.

Studies have consistently demonstrated cognitive improvements associated with computerized cognitive training (CCT). The Advanced Cognitive Training for Independent and Vital Elderly (ACTIVE) study was designed to evaluate the efficacy of cognitive training in 2,832 healthy adults age >65 across 6 recruitment sites in the United States.25 Participants were randomized to a control group (no treatment) or to 1 of 3 treatment groups:

  • memory strategy training (instructor-led, not computerized)
  • reasoning training (instructor-led, not computerized)
  • speed training (no instructor, adaptive computerized training).

Each treatment group received 10 sessions of classroom-based training (1 hour each, twice per week for 5 weeks). Following the intervention, participants who had completed ≥8 sessions were randomized to receive 4 booster sessions at 11 and 35 months after the initial training, or no booster sessions.

Each cognitive training program significantly improved performance on within-domain cognitive tests relative to the control group. Effect sizes were large immediately following training; they declined over time, but were still significant at 10-year follow-up. As hypothesized, training effects did not generalize to neuropsychological tests in other training domains. The booster subgroup of speed training showed improved performance on a separate functional speed measure at 2-year26 and 5-year follow-up.27 Each condition showed slower decline in instrumental activities of daily living relative to the control group.

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