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Alpha modulation in younger and older adults during distracted encoding
Syanah C Wynn1,2,3, Erika Nyhus2,3, Ole Jensen4
1Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, The Netherlands.
The European Journal of Neuroscience
|December 16, 2020
Summary
Older adults can successfully encode information, even with distractions, by modulating alpha power. They employ inhibitory control mechanisms similar to younger adults, but only when distraction is high, suggesting a potential age-related difference in applying these strategies.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Aging Research
Background:
- Top-down control and alpha power modulation are crucial for attention and memory encoding.
- Older adults often exhibit difficulties with attention and memory, potentially linked to impaired alpha power modulation and distractibility.
Purpose of the Study:
- To investigate age-related differences in memory performance and alpha power modulation during target encoding with distractors.
- To determine if alpha power modulation predicts memory success across different age groups and distraction levels.
Main Methods:
- Participants (older and younger adults) performed memory encoding tasks with targets and distractors.
- Electroencephalography (EEG) was used to measure alpha power modulation during encoding.
- Recognition memory for targets was assessed.
Main Results:
- Both age groups successfully encoded targets, and alpha power modulation predicted recognition success.
- Older adults exhibited higher distractibility but their memory for targets was not impaired.
- Older adults modulated alpha power (enhancing targets, inhibiting distractors) only under high distraction conditions.
Conclusions:
- Younger and older adults utilize similar inhibitory control mechanisms for memory encoding.
- Older adults' ability to modulate alpha power is context-dependent, primarily activated during high distraction.
- Age-related memory deficits may not stem from a complete failure of inhibitory control but rather from a reduced ability to deploy these mechanisms under low-distraction conditions.
