Memory deficits in aged cebus monkeys and facilitation with central cholinomimetics

Area of Science:

• Neuroscience
• Primatology
• Pharmacology

Background:

• Aged Cebus monkeys exhibit memory impairments comparable to elderly humans and demented patients.
• Delayed response tasks are used to assess recent memory ability in primates.

Purpose of the Study:

• To evaluate the efficacy of three cholinomimetics in improving recent memory in aged Cebus monkeys.
• To investigate the relationship between drug administration and memory performance in aged primates.

Main Methods:

• Cebus monkeys of different age groups were trained on a delayed response task.
• The effects of choline, physostigmine, and arecoline were assessed at various doses.
• Performance was measured by the ability to remember stimulus location over increasing durations.

Main Results:

• Choline did not improve memory performance in aged monkeys.
• Physostigmine showed performance enhancement in some aged monkeys, but optimal dosage varied significantly.
• Arecoline demonstrated consistent memory improvement within a specific dose range across subjects.

Conclusions:

• Different cholinomimetics have varying effects on memory performance in aged primates.
• Direct cholinergic receptor stimulation may yield more robust and consistent memory improvements in aged subjects.
• These findings offer insights into potential therapeutic strategies for age-related memory decline.