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Stimulering for at forbedre hukommelsen (STIM)

29. juni 2026 opdateret af: Benjamin Hampstead, PhD, University of Michigan

Afprøvning af High Definition Transcranial Direct Current Stimulation (HD-tDCS) som behandling af mild kognitiv svækkelse

Denne undersøgelse vil teste virkningerne af forskellige doser af en form for ikke-invasiv hjernestimulering til behandling af personer med mild kognitiv svækkelse (MCI) og demens af Alzheimers type (DAT).

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Denne forskningsundersøgelse udføres for at lære vigtig information om virkningerne af svag elektrisk stimulation på hjernens funktion hos personer med mild kognitiv svækkelse (MCI) og demens af Alzheimers type (DAT). Resultaterne vil hjælpe med at bestemme "hvor meget" stimulering er nødvendig for at forbedre hukommelsen og tænkeevner, hvordan det påvirker hjernens funktion, og hvem der er mest tilbøjelige til at få gavn af det. I sidste ende kan denne information vejlede behandlingsindsatsen for personer i forskellige stadier af Alzheimers sygdom. Undersøgelsen vil bruge hjernebilleddannelse til at se, om disse behandlinger ændrer, hvordan deltagerne lærer og husker information. Funktionel magnetisk resonansbilleddannelse (fMRI) og positronemissionstomografi (PET) scanninger vil blive brugt. Undersøgelsen vil også bruge kognitive tests og spørgeskemaer til at undersøge, om deltagernes hukommelse (og relaterede evner) ændrer sig på grund af behandlingen. Undersøgelsen vil optage deltagere med en diagnose MCI eller DAT. Det forventes, men ikke påkrævet, at deltagere vil blive medindskrevet i University of Michigan Memory and Aging Project (UM-MAP; HUM00000382).

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

233

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Undersøgelse Kontakt Backup

Studiesteder

    • Michigan
      • Ann Arbor, Michigan, Forenede Stater, 48105
        • University of Michigan

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

55 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Beskrivelse

Inklusionskriterier:

  1. Diagnose af mild kognitiv svækkelse (MCI) eller demens af Alzheimers type (DAT)
  2. Skal være MRI-kompatible, kriterier, der også gælder for High Definition transkraniel jævnstrømsstimulering (HD-tDCS; f.eks. fravær af metalliske eller elektroniske implantater i overkroppen eller hovedet)
  3. Stabil på relevant medicin i mindst 4 uger før studieoptagelse

Ekskluderingskriterier:

  1. Visse neurologiske sygdomme
  2. Visse psykiatriske tilstande
  3. Alvorlig sensorisk svækkelse

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Tredobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Sham-komparator: Sham-stimulering
Sham (placebo) dosis af HD-tDCS behandling i 30 minutter, i mellem 5-30 sessioner.
Deltagerne vil modtage falsk (placebo) HD-tDCS i 30 minutter i mellem 5-30 sessioner.
Eksperimentel: 1 mA Doseringsstimulering
1 milliAmp dosis af HD-tDCS behandling i 30 minutter, i mellem 5-30 sessioner.
Deltagerne vil modtage HD-tDCS ved 1 mA i 30 minutter i mellem 5-30 sessioner.
Eksperimentel: 2 mA Doseringsstimulering
2 milliAmp dosis af HD-tDCS behandling i 30 minutter, i mellem 5-30 sessioner.
Deltagerne vil modtage HD-tDCS ved 2 mA i 30 minutter i mellem 5-30 sessioner.
Eksperimentel: 3 mA Doseringsstimulering
3 milliAmp dosis af HD-tDCS behandling i 30 minutter, i mellem 5-30 sessioner.
Deltagerne vil modtage HD-tDCS ved 3 mA i 30 minutter i mellem 5-30 sessioner.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in Lateral Temporal Cortex Connectivity
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Primary outcome focuses on default mode network (DMN) between-network functional connectivity because the lateral temporal cortex is a core component of the DMN. Between-network functional connectivity is estimated from fMRI data as strength of temporal coupling between the DMN and other high-level (association) brain networks. For each participant and time point, correlation-based connectivity (Pearson r; Fisher r-to-z transformed; arbitrary units) computed between DMN regions and other regions of the association cortex defined using standard functional atlas. Higher values reflect stronger functional connectivity between DMN and other regions. A Z-score's range is infinite. Expected value is between -3 to 3. Analyses conducted separately for amyloid negative (A-) and amyloid positive (A+) participants. Post Intervention data collection was on day 5 of treatment. Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks, longest was 43 wks.
Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Self-Report of Contentment With Memory
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

The Multifactorial Memory Questionnaire (MMQ) consists of three scales measuring separate aspects of metamemory. Items are rated on a 5-point Likert scale (0-4) based on the test taker's experiences over the previous two weeks.

MMQ-Satisfaction (formerly called MMQ-Contentment) scale measures satisfaction, concern, and overall appraisal of one's own memory. Each of 18 statements is rated based on degree of agreement. The score range is 0 to 72, with higher scores indicating a higher degree of satisfaction.

Post Intervention data collection was on day 5 of treatment. Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks, longest was 43 wks.

Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Self-Report of Memory Mistakes
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

Multifactorial Memory Questionnaire (MMQ) Ability Score - This scale measures self-perception of everyday memory ability. Respondents rate how often they experienced each of 20 common memory mistakes over the previous two weeks. The score range is 0 to 80, with higher scores indicating better self-reported memory ability.

Post Intervention data collection was on day 5 of treatment. Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks, longest was 43 wks.

Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Self-Report of Memory Strategies Used
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

Multifactorial Memory Questionnaire (MMQ) Strategies Score - This scale measures the use of practical memory strategies and aids in day-to-day life. Respondents rate how often they used each of 19 memory strategies over the previous two weeks. The score range is 0 to 76, with higher scores indicating greater use of memory strategies.

Post Intervention data collection was on day 5 of treatment. Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks, longest was 43 wks.

Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Change in Memory Functioning
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
The Repeatable Battery of the Assessment of Neuropsychological Status (RBANS) is a comprehensive neuropsychological battery for the evaluation of global cognition. The delayed memory section is a measure of delayed recall and recognition for verbal and visual information. It includes the subtests List Recall, List Recognition, Story Memory, and Figure Recall. Low scores on this index indicate difficulties with recognition and retrieval of information from long-term memory stores This index is composed of both auditory and visual measures; therefore, a severe deficit in language, auditory processing, or visual functioning may impact one of the measures more than the other. Analysis included the sum of the raw scores for each of the delayed memory subtests, with possible scores ranging from 0 to 62. Post Intervention data collection was on day 5 of treatment. Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks, longest was 43 wks.
Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Change in Overall Fluid Cognitive Abilities
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

Cognitive function was determined using the NIH Toolbox-Cognition Battery computerized tests, specifically the Fluid composite score. It is derived by averaging the subtests in the Fluid domain to achieve an overall standard score. Fully Corrected T-scores are adjusted for for age, gender, race/ethnicity, and educational attainment. The score compares the score of the participant to those in the NIH Toolbox nationally representative normative sampling. The T-score has a mean of 50 in the general population and a SD of 10. Scores higher than the mean indicate better performance.

Post Intervention data collection was on day 5 of treatment. Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks, longest was 43 wks.

Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Cumulative Working Memory Effects of HD-tDCS Across Treatment Sessions
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

The n-back test is a working memory task where participants identify stimulus that matches stimulus experienced "n" steps back. Participants performed a 2-back test, in which they were asked to remember and press a button when shown a stimulus that appeared 2 steps before the current one (e.g. square, circle, square).

The number of correct and incorrect identifications are normalized (z-score). Total score is the z-score of correct button presses minus the z-score of incorrect button presses. A higher score (d') reflects better working memory performance. Possible scores range from -4.85 to 4.85. Positive change (increase) in 2-back score across treatment sessions indicates improvement in working memory performance. Data is shown as the mean slope calculation of participants across first 5 days of treatment and across all treatments, x=days of treatment, y=n-back score.

Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks.

Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Cumulative Memory Accuracy Effects of HD-tDCS Across Treatment Sessions
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

Paired Associates task is a verbal memory task that asks participants to learn a list of word pairs. After a delay, participants are shown correct and mismatched word pairs one at a time and asked to identify if the displayed word pair was from the list they were asked to learn or not.

Total accuracy is a proportion (total correct responses divided by total trials completed) ranging from 0 to 1 that measures the accuracy of a participant's responses to both correct and mismatched word pairs. Higher scores indicate better verbal memory performance, and positive changes over time indicate an improvement in verbal memory performance, measured after baseline (Session 1) and every intervention session (Sessions 2-5)

Data is shown as the mean slope calculation of participants across first 5 days of treatment and across all treatments, x=days of treatment, y= total accuracy.

Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks.

Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Cumulative Memory Sensitivity Effects of HD-tDCS Across Daily Sessions
Tidsramme: Baseline
Verbal memory performance for computerized Paired Associates task, summarized with a computational model (linear ballistic accumulator decision model). The model uses each participant's accuracy and reaction times across trials to estimate how efficiently they accumulate information to distinguish previously studied (target) word pairs from new (lure) pairs. Reported outcome is the average memory sensitivity score at baseline, expressed as unitless model values (scores on a scale) where higher scores indicate better discrimination, scores near zero indicate chance-level performance, and negative scores (if present) indicate performance worse than chance.
Baseline
Tolerability of HD-tDCS
Tidsramme: Assessed immediately after each HD-tDCS session (participants received up to 30 sessions over approximately 1-12 weeks); values represent mean symptom burden averaged across all post-stimulation assessments
Tolerability was assessed using the HD-tDCS Safety Questionnaire, an 11-item symptom checklist. The questionnaire assesses the presence (yes/no) of 10 specific self-reported symptoms (Itching, Burning, Tingling, Scalp Pain, Trouble Concentrating, Sleep problems, Headache, Mood Change, Neck Pain, and Other symptoms) and 1 oberserved symptom, Skin Redness. Skin Redness was excluded from this analysis as it is not related to the participant's perception of tolerability. The total score (symptom burden) was calculated by summing the number of symptoms present across the 10 items for each session. Score range: 0 to 10 symptoms, where 0 = no symptoms present and 10 = all symptoms present. Higher scores indicate worse tolerability (more symptoms experienced). Values represent the mean number of symptoms per session, calculated by averaging symptom burden scores across all post-stimulation assessments within each treatment group.
Assessed immediately after each HD-tDCS session (participants received up to 30 sessions over approximately 1-12 weeks); values represent mean symptom burden averaged across all post-stimulation assessments
Effectiveness of Blinding of HD-tDCS
Tidsramme: Assessed immediately after each HD-tDCS session (participants received up to 30 sessions over approximately 1-12 weeks)
Participant's perception of treatment assignment assessed after each stimulation session using a 3-category ordinal scale. Participants guessed whether they received: (0) Sham stimulation, (1) Don't Know, or (2) Active stimulation. The scale is ordinal with Sham < Don't Know < Active. Effective blinding is indicated by no significant difference in the distribution of perceived assignment between active and sham groups (i.e., participants in active groups cannot reliably distinguish their treatment from sham). Higher proportional odds ratios would indicate active group participants were more likely to guess "active"; lower ratios would indicate sham participants were more likely to guess "active" (paradoxical pattern suggesting convincing sham condition).
Assessed immediately after each HD-tDCS session (participants received up to 30 sessions over approximately 1-12 weeks)
Change in Default Mode Network Connectivity
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

The outcome focuses on default mode network (DMN) within-network functional connectivity. Within-network functional connectivity is estimated from fMRI data as strength of temporal coupling within DMN regions (nodes). For each participant and time point, correlation-based connectivity (Pearson r; Fisher r-to-z transformed; arbitrary units) was computed between DMN regions defined using a standard functional atlas. Higher values reflect stronger functional connectivity within DMN. A Z-score's range is infinite. Expected value is around -3 to 3. Analyses are conducted separately for amyloid negative (A-) and amyloid positive (A+) participants.

Post Intervention data collection was on day 5 of treatment. Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks, longest was 43 wks.

Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Cumulative Cognitive Change Across Daily Consecutive Sessions
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Measured through change in Cogstate or other comparable computerized cognitive testing scores across consecutive daily sessions.
Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).
Change in Global Cognition
Tidsramme: Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

The Repeatable Battery of the Assessment of Neuropsychological Status (RBANS) is a comprehensive neuropsychological battery for the evaluation of global cognition and has been validated in subjects with mild cognitive impairment, moderate to severe traumatic brain injuries, vascular dementias, and Alzheimer's disease. Data was analyzed using the sum of the subtest raw scores, which is an indicator of the general cognitive functioning of the examinee. Low scores suggest general cognitive impairment even when some individual subtest scores may be within normal limits. Individuals with low scores on this measure exhibit problems with attention, memory, language, and construction skills. Possible scores range from 0 to 321.

Post Intervention data collection was on day 5 of treatment. Post-Expansion (PE) appointments were not consecutive. Mean time between enrollment and PE was 10 wks, longest was 43 wks.

Change from Baseline to Post-Intervention (after tDCS Session 5 - day 5 of treatment) and from Baseline to Post-Expansion (after the participant's final tDCS session beyond Session 5, up to 43 weeks).

Andre resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Ændring i hæmningsevne
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
A priori intention om at måle gennem ændring i NIH Toolbox Flanker Inhibitory Control and Attention Test Score
Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Ændring i konceptualiseringsevne
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
A priori intention om at måle gennem ændring i NIH Toolbox Dimensional Change Card Sort Test Score
Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Ændring i billedsekvenshukommelsen
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
A priori intention om at måle gennem ændring i NIH Toolbox Picture Sequence Memory Test Score
Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Ændring i arbejdshukommelsesevnen
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
A priori intention om at måle gennem ændring i NIH Toolbox List Sorting Working Memory Test Score
Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Ændring i behandlingshastighed
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
A priori intention om at måle gennem ændring i NIH Toolbox Pattern Comparison Processing Speed ​​Test Score
Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Ændring i visuospatial funktion
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Målt gennem ændring i RBANS Visuospatial Index score
Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Ændring i sprogfunktion
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Målt gennem ændring i RBANS sprogindeksscore
Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Ændring i opmærksomhed
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Målt gennem ændring i RBANS Attention Index score
Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Ændring i hukommelsesfunktion
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Målt gennem ændring i RBANS Immediate Memory Index-score
Baseline og post-intervention (efter tDCS sessioner 5 og 30)
Ændring i kognitiv funktion
Tidsramme: Baseline og post-intervention (efter tDCS sessioner 5 og 30)
A priori hensigt om at måle gennem ændringer i RBANS deltestscore
Baseline og post-intervention (efter tDCS sessioner 5 og 30)

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Samarbejdspartnere

Efterforskere

  • Ledende efterforsker: Benjamin Hampstead, PhD, Associate professor

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

1. april 2019

Primær færdiggørelse (Faktiske)

6. december 2024

Studieafslutning (Faktiske)

19. december 2024

Datoer for studieregistrering

Først indsendt

11. marts 2019

Først indsendt, der opfyldte QC-kriterier

13. marts 2019

Først opslået (Faktiske)

14. marts 2019

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

2. juli 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

29. juni 2026

Sidst verificeret

1. juni 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • HUM00146180
  • 1R01AG058724 (U.S. NIH-bevilling/kontrakt)

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ja

produkt fremstillet i og eksporteret fra U.S.A.

Ingen

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