Sleep-dependent prospective memory consolidation is impaired with aging

Area of Science:

• Neuroscience
• Cognitive Psychology
• Sleep Research

Background:

• Sleep-dependent memory consolidation is crucial for cognitive function.
• Older adults often exhibit impaired sleep-dependent memory consolidation.
• Prospective memory (PM) is vital for daily functioning and involves future intention recall.

Purpose of the Study:

• To investigate if the role of N3 sleep in prospective memory (PM) consolidation is maintained in older adults.
• To compare the impact of sleep versus wake on PM in young and older adults.
• To examine the relationship between N3 sleep and PM performance across age groups.

Main Methods:

• Forty-nine young and 49 older adults were randomized into sleep or wake groups.
• Participants encoded related and unrelated intentions after a semantic task.
• PM was assessed 12 hours later during a second semantic task under either overnight sleep or daytime wake conditions, with polysomnography used for sleep assessment.

Main Results:

• A significant interaction indicated that sleep benefited young adults' performance on related intentions but not older adults'.
• Sleep did not enhance PM for unrelated intentions in either age group.
• Post-encoding N3 sleep was associated with related intention execution in young adults, but not in older adults.

Conclusions:

• The age-related impairment in sleep-dependent memory consolidation extends to prospective memory.
• The findings suggest a functionally weakened link between sleep and memory in older adulthood.
• N3 sleep's role in PM consolidation may diminish with advancing age.