A multi-timescale, multi-method perspective on older adult neurocognitive adaptability

Area of Science:

• Neuroscience
• Psychology
• Gerontology

Background:

• Ethical and economic imperatives necessitate better screening, monitoring, and enhancement of neurocognitive adaptability in older adults.
• Current research recognizes neurocognitive adaptability as a complex, multi-timescale, and multi-mechanistic process.
• Existing frameworks lack methods to integrate these perspectives for clinical application.

Purpose of the Study:

• To analyze neurocognitive adaptability across multiple timescales in healthy older adults.
• To investigate the predictive roles of cognitive reserve and conscientiousness on cognitive performance trajectories.
• To demonstrate a novel methodology for studying within-person changes in cognitive function.

Main Methods:

• A multi-method, multi-timescale analysis was conducted on healthy older adults.
• Participants completed a computerized cognitive flexibility task across multiple laboratory visits over approximately one month.
• Multi-level linear regression analyzed cognitive reserve and conscientiousness as predictors of within-person performance changes at second and day/week timescales.

Main Results:

• Cognitive reserve predicted performance at the second timescale (within occasions) but not the day/week timescale (across occasions).
• Conscientiousness predicted performance at both timescales.
• Different task components (stimulus-classification vs. set-shifting) showed distinct practice-related improvement rates.

Conclusions:

• Neurocognitive adaptability is influenced by multiple biopsychosocial mechanisms.
• Clinical indices like cognitive reserve and conscientiousness may reflect distinct aspects of neurocognitive adaptability crucial for maintaining independence.
• The study's framework highlights that neurocognitive adaptability operates across hierarchical temporal scales.