Study Results
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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COMPLETED
NA
86 participants
INTERVENTIONAL
2019-05-22
2025-05-31
Brief Summary
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Detailed Description
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Conditions
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Study Design
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RANDOMIZED
CROSSOVER
BASIC_SCIENCE
DOUBLE
Study Groups
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DLPFC Stimulation
Intervention. 20 minutes of 2 mA direct current stimulation over the dorsolateral prefrontal cortex.
Transcranial Direct Current Stimulation
In tDCS, saline-soaked electrodes are temporary affixed to the scalp and connected to a battery-powered current generator. A weak (2 mA) constant current is then briefly applied (\~20 minutes) to stimulate the targeted brain area (e.g. the DLPFC). To control for placebo effects, the study will utilize a sham stimulation protocol that consists of very brief constant stimulation (\~1 minute). Subjects usually cannot discern the difference between the sham and experimental stimulation protocols due to habituation.
Occipital Stimulation
Intervention. 20 minutes of 2 mA direct current stimulation over the occipital cortex.
Transcranial Direct Current Stimulation
In tDCS, saline-soaked electrodes are temporary affixed to the scalp and connected to a battery-powered current generator. A weak (2 mA) constant current is then briefly applied (\~20 minutes) to stimulate the targeted brain area (e.g. the DLPFC). To control for placebo effects, the study will utilize a sham stimulation protocol that consists of very brief constant stimulation (\~1 minute). Subjects usually cannot discern the difference between the sham and experimental stimulation protocols due to habituation.
Sham Stimulation
Placebo Comparator. 0.5-1 minutes of 2 mA direct current stimulation over the dorsolateral prefrontal cortex followed by 19-19.5 minutes of sham stimulation
Transcranial Direct Current Stimulation
In tDCS, saline-soaked electrodes are temporary affixed to the scalp and connected to a battery-powered current generator. A weak (2 mA) constant current is then briefly applied (\~20 minutes) to stimulate the targeted brain area (e.g. the DLPFC). To control for placebo effects, the study will utilize a sham stimulation protocol that consists of very brief constant stimulation (\~1 minute). Subjects usually cannot discern the difference between the sham and experimental stimulation protocols due to habituation.
Interventions
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Transcranial Direct Current Stimulation
In tDCS, saline-soaked electrodes are temporary affixed to the scalp and connected to a battery-powered current generator. A weak (2 mA) constant current is then briefly applied (\~20 minutes) to stimulate the targeted brain area (e.g. the DLPFC). To control for placebo effects, the study will utilize a sham stimulation protocol that consists of very brief constant stimulation (\~1 minute). Subjects usually cannot discern the difference between the sham and experimental stimulation protocols due to habituation.
Eligibility Criteria
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Inclusion Criteria
* All subjects must have the ability to give valid informed consent.
* Diagnosis of schizophrenia, schizophreniform or schizoaffective disorder
* No medication changes in the prior month
* No medication changes anticipated in the upcoming month
* Stable outpatient or partial hospital status
* Normal IQ (\>70; IQ will be measured by administering the Wechsler Abbreviated Scale of Intelligence (WASI) test)
Exclusion Criteria
* Implanted electrical (brain and spinal) stimulators
* Implanted defibrillator
* Metallic implants
* Skin damage or skin conditions such as eczema at the sites where electrodes will be placed
* Hair styles hindering the placement of electrodes
* Cranial pathologies
* Head trauma
* Epilepsy
* Mental retardation
* Any known history of neurological disorders (including epilepsy, amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), stroke, cerebral palsy, any DSM-5 axis I psychiatric disorder (for healthy control subjects), autism)
* Uncorrected vision problems that would hinder cognitive testing (this also pertains to subjects with color blindness in tasks where discriminating colored objects/items is necessary for successful performance)
* Pregnancy
* Substance dependence in the past six months
* Substance abuse in the past month
18 Years
50 Years
ALL
Yes
Sponsors
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University of California, Davis
OTHER
Responsible Party
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Locations
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Imaging Research Center
Sacramento, California, United States
Countries
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Related Links
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Learn more or sign up for the study here!
Other Identifiers
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UCD#3565
Identifier Type: OTHER
Identifier Source: secondary_id
1344169
Identifier Type: -
Identifier Source: org_study_id
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