Memory Enhancement in Aging With Closed-Loop tACS

Официальное название

Personalized Memory Enhancement in Aging: Pattern-Optimized tACS With Closed-Loop Precision Modulation

Обзор

This project optimizes high-resolution tACS to improve memory in healthy older adults, advancing drug-free approaches for ADRD. We test stimulation schedules and develop an adaptive, brain-guided tACS system to strengthen memory-supporting networks.

Подробное описание

Cognitive decline, especially in memory and executive control, poses an escalating public health challenge as the population ages, contributing to loss of independence, reduced quality of life, and increased healthcare costs associated with Alzheimer's disease and related dementias (ADRD). Despite decades of research, there are few effective, non-pharmacological interventions capable of slowing or reversing these cognitive losses. Transcranial alternating current stimulation (tACS) has recently emerged as a promising, safe, and non-invasive technique for modulating neural rhythms that support memory. However, existing approaches remain limited by one-size-fits-all stimulation schedules that fail to account for individual brain connectivity patterns or dynamic fluctuations in cognitive state.

This project aims to advance precision neuromodulation for cognitive aging by optimizing and personalizing high-resolution tACS protocols to enhance memory in older adults. Building on strong pilot data demonstrating the feasibility of personalized and adaptive stimulation, we will use multimodal imaging (EEG and fMRI) to track changes in frontotemporal synchrony, specifically theta-gamma phase-amplitude coupling and theta phase synchronization, that are known to support memory formation and retrieval.

Aim 2 will develop and test a connectivity-guided closed-loop tACS system that continuously monitors neural synchronization in the frontotemporal network and adjusts stimulation parameters in real time. This adaptive framework is designed to tailor stimulation to each participant's evolving brain state, enabling more efficient and individualized cognitive enhancement than static approaches.

By integrating behavioral, electrophysiological, and neuroimaging measures with adaptive control algorithms, this research will identify reliable biomarkers of responsiveness, elucidate causal mechanisms linking neural synchrony to memory, and yield a new class of personalized, connectivity-guided interventions for cognitive decline. The findings will lay a foundation for scalable, non-invasive, and mechanism-driven treatments for ADRD and age-related memory loss, advancing the broader NIH mission of promoting healthy cognitive aging.

Вмешательства

• Устройство Peak Frequency
  Device: High definition transcranial electrical current stimulation Low-intensity, noninvasive application of electrical current to the human scalp tailored to individual peak frequency with the goal of modulating levels of neuronal excitability.
• Устройство Phase Lag
  Device: High definition transcranial electrical current stimulation Low-intensity, noninvasive application of electrical current to the human scalp tailored to individual phase lag with the goal of modulating levels of neuronal excitability.
• Устройство Peak Frequency + Phase Lag
  Device: High definition transcranial electrical current stimulation Low-intensity, noninvasive application of electrical current to the human scalp tailored to individual peak frequency and phase lag with the goal of modulating levels of neuronal excitability.
• Устройство Non-Adpative
  Device: High definition transcranial electrical current stimulation Low-intensity, noninvasive application of electrical current to the human scalp not tailored to individual peak frequency or phase lag with the goal of modulating levels of neuronal excitability.

Первичные конечные точки

• EEG phase locking value (PLV) during working memory retention [Срок оценки: Baseline, Day 2]
• Interruption suppression measured behaviorally [Срок оценки: Baseline, Day 2]
• EEG phase amplitude coupling (PAC) during working memory retention [Срок оценки: Baseline, Day 2]

Критерии участия

Критерии включения

• 65 years of age or older
• normal or corrected-to-normal vision
• color vision

Критерии исключения

• pregnant
• metal implants in head
• implanted electronic devices
• history of neurological problems or head injury
• skin sensitivity
• claustrophobia
• dementia (normal Montreal Cognitive Assessment > 25)
• depression (normal Geriatric Depression Scale < 10)
• history of psychosis
• cognitive deficits (MoCA>25)
• any psychoactive medication

Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.

Здоровые добровольцы: Да

Дизайн исследования

Распределение

Рандомизированное

Модель

Перекрёстный дизайн

Маскирование

Двойное слепое

Основная цель

Фундаментальное исследование

Центры проведения

Список центров уточняется — проверьте первичный протокол.

Идентификаторы

NCT: NCT07722598 · 4230E_4

Первоисточники (государственные реестры)

• ClinicalTrials.gov (NIH, США)

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