Inhibition Transcranial Random Noise Stimulation

Study Overview
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Brief Summary
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Inhibition control deficits is a major risk factor in the transition to the act in suicidal patients. Neuroimaging studies have shown that this failure was associated with hypoactivity in the prefrontal cortex (PFC), a brain area involved in the control of impulsivity. It was recently shown that a noninvasive brain stimulation session applied on the PFC reduces transiently impulsivity in healthy volunteers. Noninvasive brain stimulation modulates the activity and connectivity of neural network connected to the stimulation site. The investigators assume that a repetition of noninvasive brain stimulation sessions on the PFC will allow a more intense and longer lasting effect on impulsivity and cognitive control in healthy volunteers compared to a single session and to placebo stimulation. The investigators assume that this behavioral change will be accompanied by a change in brain activity measured by resting EEG for the patients in the active group. A more intense and longer lasting effect is an essential step to transfer these results to patient populations. The main objective is to study the effect of bilateral stimulation of the PFC by transcranial random noise stimulation (tRNS) on the inhibition control measured by the cognitive motor inhibition capacity (Go NoGo test). The secondary objectives are to study the effect of tRNS on verbal inhibition (measured with the Hayling test); on anxiety (measured with the State-trait anxiety inventory (STAI)),on angry (measured with the State-trait anger expression inventory (STAXI)) on verbal and nonverbal inhibition (measured by the Stroop test), on impulsive behavior (measured by the Barrat impulsiveness scale (BIS 10)) and on the neuronal electrical activity measured by EEG.

Detailed Description
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Subjects are stimulated 3 times in a day. Each 20 minutes stimulation are separated by a period of at least 30 minutes. Before and after each stimulation, inhibition is evaluated by cognitive tests (Go Nogo test, Stroop test, Hayling test) and by the BIS 10 scale. During the stimulation, subjects compleat the STAXI and STAI scales. Cognitive tests are repeated 24 hours and 8 days after the stimulation to evaluate duration of the effect. Possible side effects will be notified throughout the protocol.

Official Title
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Inhibition Control Modulation by Transcranial Random Noise Stimulation (tRNS ) on the Prefrontal Cortex Measured by Change in Go no Test

Conditions
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Impulsive Behavior, Inhibition

Intervention / Treatment
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* Device: transcranial random noise stimulation (tRNS) (Starstim)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: age between 18 and 45 years Exclusion Criteria: inability to give consent Under 18 years over 45 years pregnant women nursing mothers History of neurological or psychiatric disorders and personality disorders in Cluster impulsivity (cluster B) according to Diagnostic and Statistical Manual (DSM) IV french National Adult Reading Test (fNART): score below the 5th percentile Contraindications to the practice of transcranial brain stimulation as international safety recommendations (Rossi et al., 2009) Processing or recent psychotropic

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 45 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Sham Comparator: Sham transcranial noise stimulation<br>subjects are stimulated 3 times with sham transcranial random noise stimulation (tRNS) (Starstim) with a 30 seconds offset | Device: transcranial random noise stimulation (tRNS) (Starstim)<br>* subjects are stimulated 3 times in a day by transcranial random noise stimulation (tRNS) (Starstim). each 20 minutes stimulation are separated by a period of at least 30 minutes. before and after each stimulation, inhibition is evaluated by cognitive tests: go nogo test, stroop test, Hayling test and by the BIS 10 scale. During the stimulation, subjects compleat the STAXI and STAI scales. Cognitive tests are repeated 24 hours and 8 days after the stimulation to evaluate duration of the effect. Possible side effects will be notified throughout the protocol.<br>|
| Active Comparator: 1 Active transcranial random noise stimulation<br>subjects are stimulated 1 time with active transcranial random noise stimulation (tRNS) (Starstim) at 2mA with a oscillatory frequency between 100 and 500 Hz during 20 minutes and 2 times with sham tRNS | Device: transcranial random noise stimulation (tRNS) (Starstim)<br>* subjects are stimulated 3 times in a day by transcranial random noise stimulation (tRNS) (Starstim). each 20 minutes stimulation are separated by a period of at least 30 minutes. before and after each stimulation, inhibition is evaluated by cognitive tests: go nogo test, stroop test, Hayling test and by the BIS 10 scale. During the stimulation, subjects compleat the STAXI and STAI scales. Cognitive tests are repeated 24 hours and 8 days after the stimulation to evaluate duration of the effect. Possible side effects will be notified throughout the protocol.<br>|
| Active Comparator: 3 Active transcranial random noise stimulation<br>subjects are stimulated 3 times with active transcranial random noise stimulation (tRNS) (Starstim) at 2mA with a oscillatory frequency between 100 and 500 Hz during 20 minutes | Device: transcranial random noise stimulation (tRNS) (Starstim)<br>* subjects are stimulated 3 times in a day by transcranial random noise stimulation (tRNS) (Starstim). each 20 minutes stimulation are separated by a period of at least 30 minutes. before and after each stimulation, inhibition is evaluated by cognitive tests: go nogo test, stroop test, Hayling test and by the BIS 10 scale. During the stimulation, subjects compleat the STAXI and STAI scales. Cognitive tests are repeated 24 hours and 8 days after the stimulation to evaluate duration of the effect. Possible side effects will be notified throughout the protocol.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in go no go test | errors and reaction times | 15 minutes after the stimulation | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Stroop test | errors and reaction times | 15 minutes after the stimulation | 
| Change in Hayling test | errors and reaction times | 15 minutes after the stimulation | 
| Change in BIS 10 | motor impulsivity, cognitive impulsivity, non planning impulsivity | 24 hours and 8 days after stimulations | 
| Change in STAXI | score | 24 hours and 8 days after stimulations | 
| Change in STAI | score | 24 hours and 8 days after stimulations | 
| Change in EEG |  | 24 hours and 8 days after stimulations | 
| occurrence of adverse effects |  | 8 days after stimulations |