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Working memory revived in older adults by synchronizing rhythmic brain circuits.
Robert M G Reinhart1, John A Nguyen2
1Department of Psychological & Brain Sciences, Center for Systems Neuroscience, Cognitive Neuroimaging Center, Center for Research in Sensory Communication & Emerging Neural Technology, Boston University, Boston, MA, USA. rmgr@bu.edu.
Nature Neuroscience
|April 10, 2019
Summary
Noninvasive brain stimulation improved working memory in older adults by enhancing neural synchronization. This targeted approach offers a potential non-pharmacological intervention for age-related cognitive decline.
Area of Science:
- Neuroscience
- Cognitive Science
- Gerontology
Background:
- Normal brain aging is characterized by cognitive decline, particularly working-memory deficits.
- These deficits are linked to disrupted neural circuits, including theta-gamma phase-amplitude coupling and theta phase synchronization in frontotemporal regions.
Purpose of the Study:
- To investigate the neural mechanisms underlying working-memory decline in aging.
- To develop and evaluate a noninvasive brain stimulation technique to restore cognitive function.
Main Methods:
- A noninvasive stimulation procedure was applied to adults aged 60-76 years.
- Stimulation parameters were frequency-tuned to individual brain network dynamics.
- Neural synchronization and information flow patterns were assessed before and after stimulation.
Main Results:
- A 25-minute stimulation session led to increased neural synchronization within frontotemporal regions.
- Restoration of sender-receiver relationships in information flow was observed.
- Working-memory performance significantly improved immediately after stimulation and persisted for at least 50 minutes.
Conclusions:
- Disconnection in frontotemporal circuits, specifically theta-gamma and theta phase synchronization, underlies age-related working-memory deficits.
- Noninvasive brain stimulation can rapidly restore neural network dynamics and improve working memory in older adults.
- This study provides a foundation for non-pharmacological interventions to combat cognitive aging.
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