Cathodal tDCS impacts the fear network activity and connectivity patterns during a therapy-like extinction session

Ganho-Ávila, Ana; Guiomar, Raquel; Valério, Daniela; Gonçalves, Óscar F.; Almeida, Jorge

doi:10.1016/j.encep.2019.04.010

Cited by 2 publications

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“…In addition to task‐based functional activity, recently, the use of task‐based fMRI has become critical in probing tDCS‐induced changes in connectivity modulation, which may be especially advantageous in a context‐dependent analysis (Ganho‐Ávila et al, 2019 ; Li et al, 2019 ; Sehatpour et al, 2020 ; Wu et al, 2015 ). Task‐modulated connectivity suggests that functional connectivity may largely depend on the task that is performed during the application of tDCS.…”

Section: Discussionmentioning

confidence: 99%

Transcranial direct current stimulation to modulate fMRI drug cue reactivity in methamphetamine users: A randomized clinical trial

Ekhtiari

Soleimani

Kuplicki

et al. 2022

Human Brain Mapping

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Transcranial direct current stimulation (tDCS) has been studied as a therapeutic option to alter maladaptive brain functions associated with chronic substance use.We present a randomized, triple-blind, sham-controlled, clinical trial to determine the neural substrates of tDCS effects on drug craving. Sixty participants with methamphetamine use disorder were assigned to two groups: active tDCS (5 x 7 cm 2 , 2 mA, 20 min, anode/cathode over the F4/Fp1) and sham stimulation. Neuroimaging data of a methamphetamine cue reactivity task were collected immediately before and after stimulation. There was a significant reduction in self-reported craving after stimulation without any significant effect of time-by-group interaction. Our wholebrain analysis demonstrated that there was a global decrease in brain reactivity to cues following sham but not active tDCS. There were significant time-by-group interactions in five main clusters in middle and inferior frontal gyri, anterior insula, inferior parietal lobule, and precuneus with higher activations after active stimulation. There was a significant effect of stimulation type in the relationship between electrical current at the individual level and changes in task-modulated activation. Brain regions with the highest electric current in the prefrontal cortex showed a significant timeby-group interaction in task-modulated connectivity in the frontoparietal network. In this trial, there was no significant effect of the one session of active-F4/Fp1 tDCS on drug craving self-report compared to sham stimulation. However, activation and connectivity differences induced by active compared to sham stimulation suggested some potential mechanisms of tDCS to modulate neural response to drug cues.

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Section: Discussionmentioning

confidence: 99%

Transcranial direct current stimulation to modulate fMRI drug cue reactivity in methamphetamine users: A randomized clinical trial

Ekhtiari

Soleimani

Kuplicki

et al. 2022

Human Brain Mapping

View full text Add to dashboard Cite

show abstract

“…In addition to task-based functional activity, recently, the use of task-based fMRI has become critical in probing tDCS induced changes in connectivity modulation, which may be especially advantageous in a context-dependent analysis (Sehatpour et al 2020, Li et al 2019, Ganho-Ávila et al 2019, Wu et al 2015). Task-modulated connectivity suggests that functional connectivity may largely depend on the task that is performed during the application of tDCS.…”

Section: Discussionmentioning

confidence: 99%

Transcranial Direct Current Stimulation to Modulate fMRI Drug Cue Reactivity in Methamphetamine Users: A Randomized Clinical Trial

Ekhtiari

Soleimani

Kuplicki

et al. 2021

Preprint

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Transcranial direct current stimulation (tDCS) has been studied as an adjunctive therapeutic option to alter maladaptive cortical excitability, activity, and connectivity associated with chronic substance use via the application of a weak direct current through the brain. The underlying mechanism of action remains ambiguous, however. We present a randomized, triple-blind, sham-controlled, clinical trial with two parallel arms conducted to determine the neural substrates of tDCS effects on drug craving using an fMRI drug cue reactivity paradigm. Sixty participants with methamphetamine use disorder were randomly assigned to two groups: 30 participants to active tDCS (5x7 cm2, 2 mA, for 20 minutes, anode/cathode over the F4/Fp1 in EEG 10-20 standard system) and 30 participants to the sham group. Neuroimaging data of a methamphetamine cue reactivity (MCR) task were collected immediately before and after stimulation with subjective craving assessed before, after, and during fMRI scans. There was a significant reduction in self-reported craving after stimulation (main effect of time) without any significant effect of group, time, or by group-time interaction. Our whole-brain analysis demonstrated that brain activation decreased in all parts of the brain in the second (post-stimulation) MCR imaging session after sham stimulation (habituation) but this uniform decrease did not occur throughout the brain in the active group. There were significant interactions between the group (active vs. sham) and time (after vs. before stimulation) in five main regions; medial frontal gyrus, anterior insula, inferior parietal lobule, precuneus, and inferior frontal gyrus with higher activations after active stimulation. We simulated computational head models for each individual. There was a significant effect of group in the relationship between level of current in the above-mentioned significant clusters and changes in task-modulated activation. We also found that brain regions with the highest electric fields in the prefrontal cortex showed a significant time by group interaction in task-modulated connectivity (psychophysiological interaction during MCR) in the frontoparietal network. In this two-parallel-arms triple-blind randomized control trial, we did not find any significant effect of the one session of active F4/Fp1 tDCS on drug craving self-report compared to sham stimulation. However, connectivity differences induced by active compared to sham stimulation suggested some potential mechanisms of tDCS to modulate neural response to drug cues among people with methamphetamine use disorder.

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Cathodal tDCS impacts the fear network activity and connectivity patterns during a therapy-like extinction session

Cited by 2 publications

References 0 publications

Transcranial direct current stimulation to modulate fMRI drug cue reactivity in methamphetamine users: A randomized clinical trial

Transcranial direct current stimulation to modulate fMRI drug cue reactivity in methamphetamine users: A randomized clinical trial

Transcranial Direct Current Stimulation to Modulate fMRI Drug Cue Reactivity in Methamphetamine Users: A Randomized Clinical Trial

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