Effects of Transcranial Direct Current Stimulation Over the Left VLPFC on Cognitive Reappraisal

Study Results

Results pending

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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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

60 participants

Study Classification

INTERVENTIONAL

Study Start Date

2017-03-06

Study Completion Date

2017-10-31

Brief Summary

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This study aims to investigate the role of the left ventrolateral prefrontal cortex (VLPFC) on cognitive reappraisal, using the reinterpretation strategy. For this purpose, we will produce direct disturbance to the activity of this area through anodal and cathodal transcranial direct current stimulation during a reinterpretation task.

A double-blind randomized sham-controlled trial will be conducted. 60 healthy volunteers will be allocated into three groups. Each group will receive one type of stimulation (anodal, cathodal or sham) while accomplishing a cognitive task on reinterpretation using images from the International Affective Pictures System (IAPS). The task consists in applying a given emotional regulation condition (downregulate, upregulate or maintain emotions) to a series of images and ranking the intensity of the emotional arousal felt after doing this procedure to each picture. The effects of tDCS on the subjective evaluation of emotional arousal after reinterpretation in each group will be compared.

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Detailed Description

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60 healthy graduation and post-graduation at the Federal University of Pernambuco (UFPE) students will take part of the study. After providing written informed consent, the volunteers will respond to four online questionnaires, received by email: a sociodemographic questionnaire investigating eligibility conditions; the brazilian version of the Self-Reporting Questionnaire (SRQ-20) to screen for common psychiatric disorders; the brazilian self-report version of the Alcohol, Smoking and Substance Involvement Screening Test (ASSIST) 3.0, to screen for drug-related disorders; and the brazilian version of the Emotion Regulation Questionnaire (ERQ) to evaluate individual profile of habitual use of emotion regulation strategies. They will be oriented to contact to researchers if they have any doubts. After filling the questionnaires, the volunteers will be contacted to be informed about eligibility. Individuals with previous history of epilepsy/ convulsions, brain tumors, neurosurgery, or with brain metallic implants or pacemakers, as well as in current use of psychotropic medication will be excluded from the study. The volunteers that score less than 5 point in SRQ-20 or more than 10 points for alcohol or more than 3 points for other substances in self-report ASSIST 3.0 will also be excluded from the sample.

The selected volunteers will receive a training on the cognitive task. Firstly, they will receive a brief explanation and examples on cognitive reappraisal, the reinterpretation strategies and the instructions. Against the instruction MAINTAIN, they should simply look at the pictures and maintain their emotional experience, according to their initial interpretation of the presented situation. When facing the instruction DOWNREGULATE, they should look to the picture and imagine that the situation is better or will become better than initially perceived and when instructed to UPREGULATE, they should look to the picture and imagine that the situation is worse or will become worse than initially perceived. They will be presented on the computer screen to a series of 21 negative images preceded of a screen containing one of instructions (7 images for each instruction) and 7 neutral images preceded of a screen with the instruction maintain. The images will be presented randomly and they will be asked to generate strategies to each situation. They will be guided to provide adequate strategies to the received instructions and will receive a standardized example for each picture. After this phase, they will be presented to the same series of images in the same format as the experimental cognitive task. They will see 4 screens for each picture, following uninterruptedly. The fist will contain the strategy for 2 seconds, the second will present the picture for 8 seconds, the third will contain a visual scale from 1-7 to rank the intensity of the emotional arousal felt after applying the strategy to the picture (1=very weak; 7=very strong). They will be asked to press the correspondent number on a numerical keyboard into 5 seconds. The final screen will have the instruction RELAX for 3 seconds and they should wait and relax until the subsequent task initiate.

The experiment will be conducted 3-5 days later. Before the experiment, the participant will respond to 2 questionnaires: the first will investigate behaviors that could influence the results of the experiment (sleep, psychostimulant substance intake) and the second will evaluate the current momentaneous status of the volunteer (humor, attention, fatigue). After a brief training of the cognitive task with 6 pictures, we will proceed to the electrodes montage. tDCS (1 mA) will be applied through a pair of saline-soaked surface sponge electrodes connected to a battery-driven constant current stimulator and positioned according to the 10-20 EEG system over the left VLPFC. A 4,5x4cm "active" electrode will be placed over the crossing point between T3-Fz and F7- Cz and a 12x5cm "return" electrode will be positioned over Fp2. The big return electrode will be used to attenuate the effects of stimulation over that region. The stimulation will start 4 minutes before the beginning of the cognitive task. The participants of the real stimulation groups will receive stimulation for 20 minutes, with 10 seconds ramp-up and down periods. In the sham group, the participants will receive the stimulation for 30 seconds.

Measures of central tendency and dispersion (mean and standard deviation) for continuous variables and measures of frequency for the categorical variables will be used in the sample characterization. T-test for independent samples or qui-square will be used to verify comparability between groups for continuous and categorical variables, respectively. Shapiro-Wilk test will be used to evaluate normality. Repeated measures analyses of variance (ANOVAs) will be used to test for main effects and interaction with the within subjects factors regulation condition (downregulate, upregulate, negative maintain, neutral maintain) and the between-subjects factors (anodal, cathodal, sham stimulation) in case of normality. Paired t-test will be used for compare intra-group differences. T-test for independent samples will be conducted to compare inter-group differences. The sphericity will be verified with the Mauchly's test. Greenhouse-Geisser correction will be used when necessary. If normality is not verified, Friedman's test with post-hoc Wilcoxon test will be conducted to detect intra-group differences and post-hoc Mann-Whitney test will be conducted for inter-group differences. Two-tailed tests will be performed at 95% confidence interval for all analyses. Statistical analyses will be carried out using SPSS (Statistical Package for Social Sciences) 20.0 version for Windows (SPSS Inc, Chicago IL, USA).

Conditions

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Healthy

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

The 60 participants will be divided into 3 groups: anodal, cathodal and sham stimulation. While receiving the transcranial direct current (tDCS) stimulation, participants will perform a reappraisal task. Four series of 15 IAPS pictures will be randomly passed on a computer screen. 3 of the 4 sets of pictures contain negative pictures, matched according to valence and arousal of the IAPS norm ratings (p\<0.05) and were assigned to one of instruction condition (upregulate, downregulate or maintain). The other set will contain neutral pictures with the instruction maintain. Participants will be asked to apply the instruction assigned to each picture and then rank the intensity of negative emotional arousal felt after using the reappraisal strategy, varying from 1 (weak) to 7 (strong). ANOVA will be used to compare the median subjective emotion intensity evaluation for each strategy intra-subjects and inter-groups.

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

DOUBLE

Participants Outcome Assessors

The tDCS device was placed at the back of the participants, so they could not see the parameters of stimulation. The participants of the sham stimulation group received anode stimulation for 30s, and then the device was turned off. The participants feel the initial itching in all conditions, so the are not able to distinguish to which condition of stimulation they are submitted.

Study Groups

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Cathodal tDCS

Group Type ACTIVE_COMPARATOR

Cathodal tDCS

Intervention Type DEVICE

Volunteers will be submitted to 1,0 mA cathodal stimulation during experiment. The stimulation will be applied through a pair of saline-soaked surface sponge electrodes for 20 minutes, with a 10s ramp up and down. The 4,5 x 5,0 cm "active" electrode will be placed over the crossing point between Fz-T3 and F7-Cz and the 12 x 5 cm "return" electrode will be placed over Fp2 according to the 10-20 EEG system.

Anodal tDCS

Group Type ACTIVE_COMPARATOR

Anodal tDCS

Intervention Type DEVICE

1,0mA anodal stimulation will be applied through a pair of saline-soaked surface sponge electrodes for 20 minutes, with a 10s ramp up and down. The 4,5 x 5,0 cm "active" electrode will be placed over the crossing point between Fz-T3 and F7-Cz and the 12 x 5 cm "return" electrode will be placed over Fp2 according to the 10-20 EEG system.

Sham tDCS

Group Type SHAM_COMPARATOR

Sham tDCS

Intervention Type DEVICE

1,0 mA anodal stimulation will be applied through a pair of saline-soaked surface sponge electrodes for 30 seconds, with a 10s ramp up and down. The 4,5 x 5,0 cm "active" electrode will be placed over the crossing point between Fz-T3 and F7-Cz and the 12 x 5 cm "return" electrode will be placed over Fp2 according to the 10-20 EEG system. The participant will not know when the stimulator is turned off and will continue to perform the experimental task as in the other groups.

Interventions

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Cathodal tDCS

Volunteers will be submitted to 1,0 mA cathodal stimulation during experiment. The stimulation will be applied through a pair of saline-soaked surface sponge electrodes for 20 minutes, with a 10s ramp up and down. The 4,5 x 5,0 cm "active" electrode will be placed over the crossing point between Fz-T3 and F7-Cz and the 12 x 5 cm "return" electrode will be placed over Fp2 according to the 10-20 EEG system.

Intervention Type DEVICE

Anodal tDCS

1,0mA anodal stimulation will be applied through a pair of saline-soaked surface sponge electrodes for 20 minutes, with a 10s ramp up and down. The 4,5 x 5,0 cm "active" electrode will be placed over the crossing point between Fz-T3 and F7-Cz and the 12 x 5 cm "return" electrode will be placed over Fp2 according to the 10-20 EEG system.

Intervention Type DEVICE

Sham tDCS

1,0 mA anodal stimulation will be applied through a pair of saline-soaked surface sponge electrodes for 30 seconds, with a 10s ramp up and down. The 4,5 x 5,0 cm "active" electrode will be placed over the crossing point between Fz-T3 and F7-Cz and the 12 x 5 cm "return" electrode will be placed over Fp2 according to the 10-20 EEG system. The participant will not know when the stimulator is turned off and will continue to perform the experimental task as in the other groups.

Intervention Type DEVICE

Eligibility Criteria

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Inclusion Criteria

* graduate and post-graduate students at UFPE
* aged \> 18 years-old

Exclusion Criteria

* seizures antecedent
* brain tumor
* neurosurgery antecedent
* metalic implant on the head
* cardiac pacemaker
* current psychotropic usage
* SRQ-20 score \> 5
* ASSIST 3.0 (sum from 2-7 questions) \> 10 for alcohol or \> 3 for other drugs
* left-handed

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes