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AzTrials

Orthorexia NervosaNCT07141979

Effects of tDCS on Cognitive Flexibility and EEG Oscillations in Orthorexia Nervosa

A study testing Active tDCS in people with Orthorexia Nervosa, run by Istanbul Medipol University Hospital at 1 site in Turkey (Türkiye).

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
Search all trials

Trial summary

Orthorexia Nervosa (ON); is a condition characterized by individuals being overly focused on healthy eating habits, constantly checking and classifying the foods they will consume. ON has not yet been clinically defined as an eating disorder or in a different category, and has not been included in DSM-5. Read more about this study

Who is it for?
Ages 18 to 40 yearsHealthy volunteers can take part
Conditions the study is for
Orthorexia Nervosa
What is being tested?
Active tDCS
Type of treatment
Medical device
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
48 participants
Where
1 siteTurkey (Türkiye)
Study dates
1 Nov 2025to Jul 2027
Phase
Interventional
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 40 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Being between the ages of 18-40,
  • Having a score of 17 or less on the Beck Depression Inventory
  • Having a score of 61 or more on the Test for Orthorexia Nervosa (TON-17) for the orthorexia group

Who cannot join

  • Having a history of serious neurological and psychiatric illness,
  • Currently taking medication that alters the cortical excitability level,
  • Having visual defects that cannot be corrected with glasses
  • Use of intracranial metal objects, implanted stimulating devices or pacemakers

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Saliha Şahintürk Şentürk, PhD contact

+90 531 566 03 22

salihasahinturk@gmail.com

Melek Özden, PhD contact

+90 5079771646

melekozden1@gmail.com

Turkey (Türkiye)1 site, 1 recruiting
  • Istanbul Medipol University

    Istanbul

    Saliha Şahintürk Şentürk, PhD, +90 531 566 03 22, salihasahinturk@gmail.com

    Recruiting

Other trials in Turkey (Türkiye)

About this study

Orthorexia Nervosa (ON); is a condition characterized by individuals being overly focused on healthy eating habits, constantly checking and classifying the foods they will consume. ON has not yet been clinically defined as an eating disorder or in a different category, and has not been included in DSM-5. Cognitive flexibility can be defined as a person's ability to quickly change their thinking and behaviors to adapt to different situations and changing conditions. It has been reported that cognitive flexibility skills are impaired in ON. There is evidence that tDCS, a neuromodulation method, increases cognitive flexibility skills. On the other hand, although there are EEG studies on eating disorders, there is no EEG study directly studying ON, and there is no information on the EEG profiles of individuals with high ON scores. For this reason, EEG studies on eating disorders and obsessive behaviors are generally generalized to orthorexia nervosa and are interpreted. This study aims to compare the EEG oscillations and cognitive flexibility skills of individuals with high ON scores with a control group and to examine the effects of anodal tDCS application on these two variables. For this purpose, a total of 48 individuals, 24 healthy and 24 high ON scores, will be included in the study. Participants will be randomly assigned to tDCS experimental and control groups. Therefore, 48 participants will be divided into 4 different subgroups of 12 people each. Data collection tools will be Informed Consent Form, Demographic Information Form, Beck Depression Inventory, Orthorexia Nervosa Test (TON-17), Cognitive flexibility task. First, participants will be subjected to a cognitive flexibility task by taking simultaneous EEG recordings, then tDCS stimulation will be initiated (active or sham) and after stimulation, a cognitive flexibility task will be performed by taking simultaneous EEG recordings again. EEG analyses will be performed using the Brain-Vision Analyzer program. Repeated Measures Analysis of Variance (within-group and between-groups) will be used in statistical analyses.

Read the detailed description

Measurement instruments:

Informed Voluntary Consent Form Demographic Information Form Edinburgh Hand Preference Survey Beck Depression Scale Test of Orthorexia Nervosa (TON-17) Cognitive Flexibility Task EEG and tDCS devices Statistics: Statistical analyses will be conducted using SPSS 25.0 (Statistical Package for Social Sciences) for Windows, and EEG data will be analyzed using the Brain-Vision Analyzer software.

Descriptive statistics for group variables such as age and education will be presented as means and standard deviations, while gender will be reported as frequency and percentage.

The normality of the distribution of variables will be assessed using the Kolmogorov-Smirnov test, and appropriate parametric or non-parametric tests will be applied based on the results.

To evaluate pre-test and post-test data for cognitive flexibility and EEG measures in the experimental and control groups, Repeated Measures Analysis of Variance (within- and between-subjects) or its non-parametric equivalent, the Friedman Test, will be used.

For all statistical tests, a significance level of p < 0.05 will be considered as the threshold for statistical significance.

Being tested
Active tDCS, Sham tDCS
Keywords
Orthorexia Nervosa, cognitive flexibility, tDCS, EEG Oscillations
Medical subject headings
Orthorexia Nervosa

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Active tDCSDevice

    20 min, 2 milliampere (mA), Anodal tDCS in left DLPFC

  • Sham tDCSDevice

    20 min, left DLPFC Sham tDCS

Study groups in NCT07141979
Study groupRoleWhat they receive
Experimental groupActive comparatorParticipants will take active tDCS stimulation
Receives: Device: Active tDCS
Control groupSham comparatorParticipants will take sham tDCS stimulation
Receives: Device: Sham tDCS

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change in EEG Oscillations in individuals with Orthorexia Nervosa for active vs. sham stimulation

    The EEG oscillations recording the event brain oscillations during the cognitive flexibility task from pre and post measurements. There are the five frequencies band which are Delta (0.5-3,5 Hz), Theta (4-7 Hz), Alpha (8-13 Hz), Beta (15-30 Hz) and Gamma (30-100 Hz). Data will be record simultaneously and analyzed. The analysis will be done with the BrainVisionAnalyzer program and power analysis will be made in Delta, Theta, Alpha, Beta, Gamma bands and the averages will be compared. Oscillations will be evaluated in terms of averages changing as an indicator of the effect of the neuromodulation preceding it.

    Measured: Baseline, 5 minutes after completion of the active/sham stimulation

  2. Change in Cognitive Flexibility Task score in individuals with Orthorexia Nervosa for active vs. sham stimulation

    A structured task-switching paradigm will be used to measure cognitive flexibility skills from pre and post test score in individuals with Orthorexia Nervosa

    • The paradigm consists of two conditions: trials with a task switch and trials without a task switch. The experiment will include two blocks, with a total of 320 trials. Each block will contain 160 phases, consisting of 80 trials with a task switch and 80 trials without a task switch. Score averages will compare between pre and post test. Data will be record Excel by Psychopy program simultaneously. Performance will be evaluated for accuracy as an indicator of the effect of the neuromodulation preceding it.

    Measured: Baseline, 20 minutes after completion of the active/sham stimulation

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted26 Aug 2025
  2. Study start1 Nov 2025
  3. Primary completionJan 2027 (estimated)
  4. Study completionJul 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Basic science
Allocation
Randomised
Intervention model
Parallel groups
Model description
It is an experimental, randomised controlled trial. The data will be collected with the convenience sampling method from volunteer healthy people and individuals with orthorexia nervosa. The matched-group design method will be used.
Masking
Single blind
Who is masked
Participant
Enrolment
48 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07141979
Sponsor's protocol ID
E-10840098-202.3.02-35.59
Status last verified
Mar 2026
First submitted
18 Aug 2025
Last updated
1 Apr 2026
Results posted
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Emek Savas DD, Yerlikaya D, G Yener G, Oktem Tanor O. Validity, Reliability and Normative Data of the Stroop Test Capa Version. Turk Psikiyatri Derg. 2020 Spring;31(1):9-21. doi: 10.5080/u23549. English, Turkish.

    PubMed 32594475
  • Du M, Peng Y, Li Y, Zhu Y, Yang S, Li J, Zou F, Wang Y, Wu X, Zhang Y, Zhang M. Effect of trait anxiety on cognitive flexibility: Evidence from event-related potentials and resting-state EEG. Biol Psychol. 2022 Apr;170:108319. doi: 10.1016/j.biopsycho.2022.108319. Epub 2022 Mar 22.

    PubMed 35331781
  • Dong G, Wang Y, Chen X. Anodal occipital tDCS enhances spontaneous alpha activity. Neurosci Lett. 2020 Mar 16;721:134796. doi: 10.1016/j.neulet.2020.134796. Epub 2020 Jan 30.

    PubMed 32006627
  • Donaldson PH, Kirkovski M, Yang JS, Bekkali S, Enticott PG. High-definition tDCS to the right temporoparietal junction modulates slow-wave resting state power and coherence in healthy adults. J Neurophysiol. 2019 Oct 1;122(4):1735-1744. doi: 10.1152/jn.00338.2019. Epub 2019 Aug 28.

    PubMed 31461371
  • Darna M, Stolz C, Jauch HS, Strumpf H, Hopf JM, Seidenbecher CI, Schott BH, Richter A. Frontal theta oscillations and cognitive flexibility: Age-related modulations in EEG activity. Aging Brain. 2025 Jun 24;8:100142. doi: 10.1016/j.nbas.2025.100142. eCollection 2025.

    PubMed 40620518
  • Chrysikou EG, Hamilton RH, Coslett HB, Datta A, Bikson M, Thompson-Schill SL. Noninvasive transcranial direct current stimulation over the left prefrontal cortex facilitates cognitive flexibility in tool use. Cogn Neurosci. 2013;4(2):81-9. doi: 10.1080/17588928.2013.768221.

    PubMed 23894253
  • Cavinato M, Genna C, Formaggio E, Gregorio C, Storti SF, Manganotti P, Casanova E, Piperno R, Piccione F. Behavioural and electrophysiological effects of tDCS to prefrontal cortex in patients with disorders of consciousness. Clin Neurophysiol. 2019 Feb;130(2):231-238. doi: 10.1016/j.clinph.2018.10.018. Epub 2018 Nov 29.

    PubMed 30580246
  • Borwick C, Lal R, Lim LW, Stagg CJ, Aquili L. Dopamine depletion effects on cognitive flexibility as modulated by tDCS of the dlPFC. Brain Stimul. 2020 Jan-Feb;13(1):105-108. doi: 10.1016/j.brs.2019.08.016. Epub 2019 Aug 31.

    PubMed 31494070
  • Berchio C, Annen LC, Bouamoud Y, Micali N. Temporal dynamics of cognitive flexibility in adolescents with anorexia nervosa: A high-density EEG study. Eur J Neurosci. 2023 Mar;57(6):962-980. doi: 10.1111/ejn.15921. Epub 2023 Feb 7.

    PubMed 36683346
  • Alizadehgoradel J, Nejati V, Sadeghi Movahed F, Imani S, Taherifard M, Mosayebi-Samani M, Vicario CM, Nitsche MA, Salehinejad MA. Repeated stimulation of the dorsolateral-prefrontal cortex improves executive dysfunctions and craving in drug addiction: A randomized, double-blind, parallel-group study. Brain Stimul. 2020 May-Jun;13(3):582-593. doi: 10.1016/j.brs.2019.12.028. Epub 2020 Jan 3.

    PubMed 32289681
  • Aboulafia-Brakha T, Manuel AL, Ptak R. Prefrontal transcranial direct current stimulation facilitates affective flexibility. Neuropsychologia. 2016 Jun;86:13-8. doi: 10.1016/j.neuropsychologia.2016.03.030. Epub 2016 Mar 30.

    PubMed 27039163

Questions about this trial

What is this clinical trial studying?

A study testing Active tDCS in people with Orthorexia Nervosa, run by Istanbul Medipol University Hospital at 1 site in Turkey (Türkiye).

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 3 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 1 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Turkey (Türkiye). Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Saliha Şahintürk Şentürk, PhD (+90 531 566 03 22, salihasahinturk@gmail.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change in EEG Oscillations in individuals with Orthorexia Nervosa for active vs. sham stimulation (time frame: Baseline, 5 minutes after completion of the active/sham stimulation). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT07141979, which also lists 11 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 1 Apr 2026.

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