Domain-specific cognitive impairment reflects prefrontal dysfunction in aged common marmosets.

Area of Science:

• Neuroscience
• Cognitive Aging
• Primate Models

Background:

• Age-related cognitive decline varies across domains, impacting functions reliant on brain regions with significant age-related changes.
• The common marmoset is a promising model for neuroscience, but lacks comprehensive cognitive aging studies.
• Understanding age-related cognitive changes in marmosets is crucial for evaluating them as models of human cognitive aging.

Approach:

• Characterized stimulus-reward association learning and cognitive flexibility in marmosets across the lifespan.
• Utilized Simple Discrimination and Serial Reversal tasks to assess cognitive functions.
• Compared cognitive performance in young adult versus geriatric marmosets.

Key Points:

• Aged marmosets show transient "learning-to-learn" impairments but retain stimulus-reward association abilities.
• Cognitive flexibility is impaired in aged marmosets due to increased susceptibility to proactive interference.
• These age-related deficits are concentrated in prefrontal cortex-dependent cognitive domains.

Conclusions:

• The marmoset exhibits domain-specific cognitive aging, mirroring patterns observed in humans.
• Findings support prefrontal cortex dysfunction as a key feature of neurocognitive aging.
• The common marmoset is validated as a valuable model for investigating the neural basis of cognitive aging.