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Domain general processes moderate age-related performance differences on the mnemonic similarity task
Chris M Foster1, Kelly S Giovanello1,2
1Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Memory (Hove, England)
|March 25, 2020
Summary
Cognitive aging affects memory performance, particularly on tasks like the mnemonic similarity task. Processing speed and inhibitory function significantly moderate these age-related memory declines.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
- Gerontology
Background:
- Domain general theories, such as processing speed and inhibitory function, are used to explain cognitive aging.
- Age-related episodic memory changes may be influenced by a bias towards pattern completion.
- The mnemonic similarity task is a key paradigm for studying hippocampal pattern separation and completion.
Purpose of the Study:
- To investigate whether domain-general cognitive aging processes influence performance on the mnemonic similarity task.
- To determine if processing speed and inhibitory function moderate age-related decrements in mnemonic similarity task performance.
Main Methods:
- Two experiments were conducted with 100 healthy younger and older adults.
- Experiment 1 manipulated encoding time to assess processing speed.
- Experiment 2 used item-level directed forgetting to assess inhibitory function.
Main Results:
- Significant interactions between age group and encoding manipulation were observed in both experiments.
- Older adults showed performance decrements on the mnemonic similarity task.
- Processing speed and inhibitory function were found to moderate these age-related performance differences.
Conclusions:
- Age-related performance differences on the mnemonic similarity task are partially explained by domain-general processes.
- Processing speed and inhibitory function play a moderating role in age-related memory decline.
- These findings support the integration of domain-general cognitive aging theories with specific memory tasks.
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