Diese Seite wurde automatisch übersetzt und die Genauigkeit der Übersetzung wird nicht garantiert. Bitte wende dich an die englische Version für einen Quelltext.

Default Mode Network Connectivity and Nocebo Responses in Migraine: A Functional MRI Study (Does not exist)

17. Juli 2026 aktualisiert von: Ioanna Spanou

People with migraine sometimes experience symptoms because they expect a treatment to cause side effects. This is known as the "nocebo effect". Unlike a drug side effect, a nocebo effect is triggered by negative expectations rather than by the treatment itself. Nocebo effects can reduce patients' confidence in treatment and may lead them to stop taking medications that could help control their migraine. Understanding why some people are more likely to experience nocebo effects could help healthcare professionals improve treatment discussions and support long-term treatment adherence.

The aim of this study was to investigate whether changes in brain activity are associated with nocebo responses in people with migraine. Researchers focused on the "default mode network" (DMN), a group of interconnected brain regions involved in self-reflection, emotions, memory, and expectations. Because expectations play an important role in nocebo effects, the researchers examined whether communication within this brain network changed during a nocebo challenge.

Forty adults with migraine were recruited from the Headache Clinic of Aeginition Hospital, National and Kapodistrian University of Athens, between October 2019 and February 2023. All participants underwent magnetic resonance imaging (MRI) and resting-state functional MRI (rs-fMRI), a technique that measures communication between brain regions while a person is resting. Participants were then randomly assigned to one of three groups. One group received an intravenous saline infusion together with the suggestion that they might experience numbness. A second group received only the same verbal suggestion, without the saline infusion. A third group received no intervention. Thirty minutes later, participants reported whether they had experienced numbness before undergoing a second brain scan. Participants also completed a questionnaire measuring their susceptibility to nocebo effects. Four participants were excluded because excessive movement affected the quality of their MRI scans, leaving 36 participants for the final analysis.

This study investigated whether changes in DMN connectivity were associated with the nocebo challenge and whether these changes differed between participants who did and did not report numbness. By identifying brain mechanisms involved in nocebo responses, this research may improve our understanding of why some people are more susceptible than others. Although the study was exploratory and included a relatively small number of participants, its findings may contribute to future strategies that help clinicians identify patients at greater risk of nocebo responses, communicate more effectively about treatment, and improve adherence to migraine therapies. Larger studies are needed to confirm these findings before they can be applied in routine clinical practice.

Studienübersicht

Status

Abgeschlossen

Bedingungen

Intervention / Behandlung

Studientyp

Interventionell

Einschreibung (Tatsächlich)

40

Phase

  • Unzutreffend

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienorte

      • Athens, Griechenland, 11528
        • 1st Neurogy Department, Aeginition Hospital, National and Kapodistrian Hospital

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

  • Erwachsene

Akzeptiert gesunde Freiwillige

Nein

Beschreibung

Inclusion Criteria:

  • Diagnosis of migraine (ICHD-3)
  • Age 18-55 years
  • Right-handedness
  • Be able to read and sign written informed consent in Greek
  • Absence of migraine attack during the experiment

Exclusion Criteria:

  • Diagnosis of chronic migraine
  • Cognitive disorders requiring medication
  • Pregnancy or breastfeeding
  • Presence of any metallic objects in the eyes or central nervous system
  • Implanted metallic or electronic devices (e.g. cardiac pacemaker, metallic cardiac valve, cochlear implant, orthopedic implants
  • History of claustrophobia
  • Use of prophylactic anti-migraine treatment during recruitment

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

  • Hauptzweck: Sonstiges
  • Zuteilung: Zufällig
  • Interventionsmodell: Parallele Zuordnung
  • Maskierung: Verdreifachen

Waffen und Interventionen

Teilnehmergruppe / Arm
Intervention / Behandlung
Experimental: Arm 1: Enhanced nocebo challenge
An intravenous "contrast agent" (10 ml of normal saline 0.9%) was administrated, and participants were informed that they will be given an intravenous "contrast agent", needed for the second rs- fMRI scan, that may numb one side of their body
An intravenous "contrast agent" (10 ml of normal saline 0.9%) was administrated, and participants were informed that they will be given an intravenous "contrast agent", needed for the second rs- fMRI scan, that may numb one side of their body.
Experimental: Arm 2 : Verbal nocebo challenge
Participants did not receive any "contrast agent", but were informed that during the second fMRI scan, "they may feel numbness", thus they received negative verbal suggestion only
Participants did not receive any "contrast agent", but were informed that during the second fMRI scan, "they may feel numbness", thus they received negative verbal suggestion only.
Experimental: Arm 3 : No challenge
This group did not receive any "contrast agent" or negative verbal suggestion
This group did not receive any "contrast agent" or negative verbal suggestion

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Functional Connectivity (FC) changes within Default Mode Network (DMN)-related regions both interictally and during an anxiety-mediated nocebo challenge
Zeitfenster: A 2nd resting- state functional Magnetic Resonance Imaging (rs- fMRI) scan was performed 30 minutes after the 1st rs- fMRI scan.
All functional and anatomical 3D high-resolution (HR)-T1-weighted images were preprocessed using the CONN toolbox and Statistical Parametric Mapping 12. The primary aim of this exploratory study was to investigate hypothesis-driven functional connectivity changes using a seed-based approach focused on specific DMN regions of interest. We examined connectivity among predefined DMN seed regions, which were defined using the default atlas implemented in the CONN toolbox. Four core DMN seeds were selected: the posterior cingulate cortex (PCC; MNI/Montreal Neurological Institute space -1, -61, 38), the medial prefrontal cortex (MPFC; MNI 1, 55, -3), the left lateral parietal cortex (LP; MNI -39, -77, 33), and the right lateral parietal cortex (LP; MNI 47, -67, 29). Each seed region was defined as a 6-mm radius sphere centered on the respective MNI coordinates, in line with standard CONN preprocessing defaults, to ensure the reproducibility of the seed-based connectivity analyses.
A 2nd resting- state functional Magnetic Resonance Imaging (rs- fMRI) scan was performed 30 minutes after the 1st rs- fMRI scan.

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Tatsächlich)

22. Oktober 2019

Primärer Abschluss (Tatsächlich)

22. Oktober 2023

Studienabschluss (Tatsächlich)

22. Oktober 2023

Studienanmeldedaten

Zuerst eingereicht

12. Juli 2026

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

17. Juli 2026

Zuerst gepostet (Tatsächlich)

22. Juli 2026

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

22. Juli 2026

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

17. Juli 2026

Zuletzt verifiziert

1. Juli 2026

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Andere Studien-ID-Nummern

  • 905/05-12-2018

Plan für individuelle Teilnehmerdaten (IPD)

Planen Sie, individuelle Teilnehmerdaten (IPD) zu teilen?

JA

Beschreibung des IPD-Plans

study protocol patient's informed consent

IPD-Sharing-Zeitrahmen

Beginning 3 months and ending 3 years after the publication of results

Art der unterstützenden IPD-Freigabeinformationen

  • STUDIENPROTOKOLL
  • ICF

Arzneimittel- und Geräteinformationen, Studienunterlagen

Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt

Nein

Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt

Nein

Diese Informationen wurden ohne Änderungen direkt von der Website clinicaltrials.gov abgerufen. Wenn Sie Ihre Studiendaten ändern, entfernen oder aktualisieren möchten, wenden Sie sich bitte an register@clinicaltrials.gov. Sobald eine Änderung auf clinicaltrials.gov implementiert wird, wird diese automatisch auch auf unserer Website aktualisiert .