- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05342727
Transcranial Direct and Alternating Stimulation of the Prefrontal Cortex for Cognitive Improvement in Schizophrenia
August 4, 2022 updated by: Mohammad Ali Salehinejad, The National Brain Mapping Laboratory (NBML)
The Impact of Transcranial Direct and Alternating Stimulation of the Prefrontal Cortex at Different Intensities and Frequencies on Cognition of Schizophrenic Patients
The purpose of this study is to investigate different stimulation intensities and frequencies of transcranial direct and alternating current stimulation over the dorsolateral prefrontal cortex for cognitive improvement in schizophrenia.
Study Overview
Status
Completed
Conditions
Detailed Description
In this randomized, double-blind study, 50 patients diagnosed with schizophrenia are randomly assigned into two arms.
The first group receives transcranial direct current stimulation (tDCS) at three intensities (2 mA, 3 mA, and sham) and the second group receives transcranial alternating current stimulation (tACS) at three different frequencies (8 Hz, 40 Hz, and sham) over the left dorsolateral prefrontal cortex for 20 min.
There are at least 72 hours between stimulation sessions.
The patients conduct three cognitive tasks from the CANTAB neuropsychological battery for schizophrenia during stimulation including a working memory task, a cognitive flexibility task, and an emotion recognition task.
Mood stability is also evaluated before and after each stimulation session with the Positive and Negative Affect Scale (PANAS).
Study Type
Interventional
Enrollment (Actual)
50
Phase
- Phase 1
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
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Ardabil, Iran, Islamic Republic of
- Ardabil University of Medical Sciences
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Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years to 50 years (Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Diagnosis of schizophrenia based on DSM V,
- Being 18-50 years old (male and female)
- If female, negative urine pregnancy test
- feasibility for tDCS interventions according to safety guidelines
- stable medication regime especially the classical neuroleptics and all CNS-activating medications, if taken, 4-6 weeks before the experiment
- fluency in the native language
- right-handed
- Required written informed consent signed by patients' guardian
Exclusion Criteria:
- pregnancy
- alcohol or substance dependence
- history of seizure
- history of neurological disorder
- history of head injury
- Presence of ferromagnetic objects in the body that are contraindicated for brain stimulation of the head (pacemakers or other implanted electrical devices, brain stimulators, some types of dental implants, aneurysm clips, metallic prostheses, permanent eyeliner, implanted delivery pump, or shrapnel fragments) or fear of enclosed spaces).
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Triple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Active Comparator: tDCS group
The tDCS arm receives two real (or active) stimulation at 2 mA and 3 mA intensities and one placebo electrical stimulation for 20 minutes.
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In tDCS, direct electrical currents at the intensity of interest (2 mA for example) are generated by an electrical stimulator and are noninvasively delivered to the scalp through a pair of saline-soaked sponge electrodes (7×5 cm).
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Active Comparator: tACS group
The tACS arm receives two real (or active) stimulation at 8 Hz and 40 Hz frequencies and one placebo alternating electrical stimulation for 20 minutes.
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In tACS, alternating electrical currents at the frequency of interest (8 Hz for example) are generated by an electrical stimulator and are noninvasively delivered to the scalp through a pair of saline-soaked sponge electrodes (7×5 cm).
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Spatial Working Memory behavioral performance
Time Frame: During procedure (4 minutes)
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The test begins with a number of coloured squares (boxes) shown on the screen.
The aim of this test is that by selecting the boxes and using a process of elimination, the participant should find one yellow 'token' in each of a number of boxes and use them to fill up an empty column on the right-hand side of the screen.
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During procedure (4 minutes)
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executive function behavioral performance
Time Frame: During procedure (8-10 minutes)
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The participant is shown two displays containing three coloured balls.
The test administrator first demonstrates to the participant how to move the balls in the lower display to copy the pattern in the upper display and completes one demonstration problem, where the solution requires one move.
The participant must then complete three further problems, one each requiring two moves, three moves and four moves.
Next the participant is shown further problems and must work out in their head how many moves the solutions require and then select the appropriate box at the bottom of the screen to indicate their response
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During procedure (8-10 minutes)
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Emotional recognition behavioral performance
Time Frame: During procedure (60 minutes)
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Computer-morphed images derived from the facial features of real individuals, each showing a specific emotion, are displayed on the screen, one at a time.
Each face is displayed for 200 milliseconds and then immediately covered up to prevent residual processing of the image.
The participant must select which emotion the face displayed from 6 options (sadness, happiness, fear, anger, disgust or surprise)
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During procedure (60 minutes)
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
The Positive and Negative Affect Schedule (PANAS)
Time Frame: through study completion in each experimental session up to 1 hour
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The Positive and Negative Affect Schedule (PANAS) is a self-report questionnaire that consists of two 10-item scales to measure both positive and negative affect.
Each item is rated on a 5-point scale of 1 (not at all) to 5 (very much).
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through study completion in each experimental session up to 1 hour
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (Actual)
April 1, 2021
Primary Completion (Actual)
July 15, 2022
Study Completion (Actual)
July 31, 2022
Study Registration Dates
First Submitted
March 26, 2022
First Submitted That Met QC Criteria
April 19, 2022
First Posted (Actual)
April 25, 2022
Study Record Updates
Last Update Posted (Actual)
August 8, 2022
Last Update Submitted That Met QC Criteria
August 4, 2022
Last Verified
August 1, 2022
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- IR.ARUMS.REC.1400.043
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
No
IPD Plan Description
Data will be available upon reasonable request from the PI after publication of results
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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