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Age-related differences in distractibility and response to methylphenidate in monkeys
M A Prendergast1, W J Jackson, A V Terry
1Alzheimer's Research Center, Department of Pharmacology/Toxicology, Department of Veterans' Affairs Medical Center, Augusta, GA, USA.
Cerebral Cortex (New York, N.Y. : 1991)
|May 30, 1998
Summary
Aging increases susceptibility to distraction, impairing attention and memory. Aged monkeys showed more distraction than young ones, with methylphenidate ineffective in older subjects.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Primate Research
Background:
- Distractibility is a common symptom in normal aging and conditions like Alzheimer's disease.
- Attention and short-term memory are crucial cognitive functions affected by aging.
Purpose of the Study:
- To investigate age-related differences in susceptibility to distraction.
- To assess the effects of methylphenidate on distractibility in aged and young monkeys.
Main Methods:
- Aged and young adult macaques performed a delayed matching-to-sample (DMTS) task.
- Task-relevant distractors were introduced during delay intervals.
- Methylphenidate was administered to assess its effects on distractibility.
Main Results:
- Aged monkeys were more impaired by distractors than young monkeys, especially on short delay trials.
- Young monkeys were only impaired by early, long distractors.
- Methylphenidate improved distractibility in young monkeys but not in aged monkeys, causing side effects in the latter.
Conclusions:
- Aged monkeys exhibit heightened susceptibility to distraction affecting attention and recall.
- Methylphenidate is not an effective treatment for distractibility in aged macaques.
- The findings highlight age-related cognitive decline in attention and memory processing.