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How Proactive Interference during New Associative Learning Impacts General and Specific Memory in Young and Old.
Brittany Corbett1, Audrey Duarte1
1Georgia Institute of Technology.
Journal of Cognitive Neuroscience
|May 20, 2020
Summary
Older adults, contrary to prior beliefs, show similar susceptibility to proactive interference as younger adults. Cognitive control processes effectively manage interference in associative memory tasks across age groups.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Human Aging Research
Background:
- Prior research suggests older adults are more vulnerable to proactive interference than younger adults.
- Proactive interference occurs when previously learned information interferes with new learning.
- Cognitive control processes mediated by the prefrontal cortex (pFC) are crucial for managing interference.
Purpose of the Study:
- To investigate if age-related deficits in pFC-mediated cognitive control contribute to increased proactive interference susceptibility.
- To examine age differences in resolving proactive interference during an associative memory task.
- To explore the neural mechanisms underlying interference resolution in young and older adults.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to scan young and older adults during an associative memory task.
- Participants encoded object-associate pairings under varying levels of proactive interference (high, low, none).
- Memory recall was tested with different levels of episodic detail.
Main Results:
- Young and older adults exhibited similar susceptibility to proactive interference.
- Memory accuracy for both general category and specific associates decreased with increased interference, with no significant age differences.
- The left ventrolateral pFC showed sensitivity to interference during encoding but not memory accuracy.
- Older adults showed greater recruitment of the ventromedial pFC, associated with monitoring, to support successful retrieval under low interference, aligning with the CRUNCH model.
Conclusions:
- Older adults can engage cognitive control processes to resolve proactive interference comparably to younger adults.
- Age-related differences in proactive interference susceptibility may not be as pronounced as previously thought.
- Neural recruitment patterns, particularly in the ventromedial pFC, suggest compensatory mechanisms in older adults for successful memory retrieval.
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