Plasticity of Deep Brain Structures in Mild Cognitive Impairment and Healthy Aging

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

19 participants

Study Classification

INTERVENTIONAL

Study Start Date

2021-09-15

Study Completion Date

2024-02-02

Brief Summary

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Acute and chronic cognitive impairment (TBI and MCI) is one of the most common problems in the growing and aging society of the 21st century. At an individual level, not all brain structures are affected with the same rate. There are subcortical structures less involved (e.g., the cerebellum), and other more involved (e.g., the hippocampus) in the cognitive decline with age or following a traumatism. To pave the way for personalized precision medicine in the field of cognitive preservation and recovery, there is a need for testing the impact of individually tailored innovative non-invasive neuro-technologies. In this project, we aim at testing the benefit of non-invasively stimulating subcortical structures to boost resilience in supporting motor and non-motor memory.

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Detailed Description

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Conditions

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Traumatic Brain Injury

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

QUADRUPLE

Participants Caregivers Investigators Outcome Assessors

Study Groups

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Placebo stimulation

Sham stimulation : ramp-up \[5 s\] immediately followed by ramp-down \[5 s\] of high-frequency currents (see Vassiliadis et al., 2023, Nat Hum Behav for more details)

Group Type PLACEBO_COMPARATOR

transcranial electric stimulation

Intervention Type OTHER

tTIS is an innovative non-invasive brain stimulation approach, in which two or more independent stimulation channels deliver high-frequency currents in the kHz range (oscillating at f1 and f1 + Δf). These high-frequency currents are assumed to be too high to effectively modulate neuronal activity. Still, by applying a small shift in frequency, they result in a modulated electric field with the envelope oscillating at the low-frequency Δf (target frequency) where the two currents overlap. The peak of the modulated envelope amplitude can be steered towards specific areas located deep in the brain, by tuning the positions of the electrodes and the current ratio across stimulation channels. Here, we applied tTIS via surface electrodes applying a low-intensity (2mA baseline to peak), sub-threshold protocol following the safety guidelines for low-intensity transcranial electric stimulation in humans.

Active stimulation

Patterned stimulation (intermittent theta-burst) generating temporal interference in the striatum; see Wessel et al., 2023, Nat Neurosci. for details

Group Type EXPERIMENTAL

transcranial electric stimulation

Intervention Type OTHER

tTIS is an innovative non-invasive brain stimulation approach, in which two or more independent stimulation channels deliver high-frequency currents in the kHz range (oscillating at f1 and f1 + Δf). These high-frequency currents are assumed to be too high to effectively modulate neuronal activity. Still, by applying a small shift in frequency, they result in a modulated electric field with the envelope oscillating at the low-frequency Δf (target frequency) where the two currents overlap. The peak of the modulated envelope amplitude can be steered towards specific areas located deep in the brain, by tuning the positions of the electrodes and the current ratio across stimulation channels. Here, we applied tTIS via surface electrodes applying a low-intensity (2mA baseline to peak), sub-threshold protocol following the safety guidelines for low-intensity transcranial electric stimulation in humans.

Interventions

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transcranial electric stimulation

tTIS is an innovative non-invasive brain stimulation approach, in which two or more independent stimulation channels deliver high-frequency currents in the kHz range (oscillating at f1 and f1 + Δf). These high-frequency currents are assumed to be too high to effectively modulate neuronal activity. Still, by applying a small shift in frequency, they result in a modulated electric field with the envelope oscillating at the low-frequency Δf (target frequency) where the two currents overlap. The peak of the modulated envelope amplitude can be steered towards specific areas located deep in the brain, by tuning the positions of the electrodes and the current ratio across stimulation channels. Here, we applied tTIS via surface electrodes applying a low-intensity (2mA baseline to peak), sub-threshold protocol following the safety guidelines for low-intensity transcranial electric stimulation in humans.

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

TBI patients:

* Age ≥ 18 years
* Clinical diagnosis of TBI
* No history of other severe neurological or psychiatric disorders

Exclusion Criteria

* Unable to consent

* Severe neuropsychiatric (e.g., major depression, severe dementia) or unstable systemic diseases (e.g., severe progressive and unstable cancer, life threatening infectious diseases)
* Severe sensory or cognitive impairment or musculoskeletal dysfunctions prohibiting to understand instructions or to perform the experimental tasks
* Inability to follow or non-compliance with the procedures of the study
* Contraindications for NIBS or MRI (1):

* Electronic or ferromagnetic medical implants/device, non-MRI compatible metal implant
* History of seizures
* Medication that significantly interacts with NIBS being benzodiazepines, tricyclic antidepressants and antipsychotics
* Regular use of narcotic drugs
* Pregnancy
* Request of not being informed in case of incidental findings
* Concomitant participation in another trial involving probing of neuronal plasticity

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No