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Published in: European Archives of Psychiatry and Clinical Neuroscience 1/2021

Open Access 01-02-2021 | Eating Disorder | Original Paper

Combined antisaccade task and transcranial direct current stimulation to increase response inhibition in binge eating disorder

Authors: Sebastian M. Max, Christian Plewnia, Stephan Zipfel, Katrin E. Giel, Kathrin Schag

Published in: European Archives of Psychiatry and Clinical Neuroscience | Issue 1/2021

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Abstract

Binge eating disorder (BED) is associated with deficient response inhibition. Malfunctioning response inhibition is linked to hypoactivation of the dorsolateral prefrontal cortex (dlPFC), where excitability could be increased by anodal transcranial direct current stimulation (tDCS). Response inhibition can be assessed using an antisaccade task which requires supressing a dominant response (i.e. saccade) towards a newly appearing picture in the visual field. We performed a double-blind, randomised, placebo-controlled proof-of-concept-study in which we combined a food-modified antisaccade task with tDCS in people with BED. We expected task learning and modulatory tDCS effects. Sixteen people were allocated to a 1 mA condition, 15 people to a 2 mA condition. Each participant underwent the food-modified antisaccade task at three measurement points: baseline without stimulation, anodal verum and sham stimulation at the right dlPFC in a crossover design. The error rate and the latencies of correct antisaccades decreased over time. No tDCS effect on the error rate could be observed. Compared to sham stimulation, 2 mA tDCS decreased the latencies of correct antisaccades, whereas 1 mA tDCS increased it. Self-reported binge eating episodes were reduced in the 2 mA condition, while there was no change in the 1 mA condition. Participants demonstrated increased response inhibition capacities by a task learning effect concerning the error rate and latencies of correct antisaccades over time as well as a nonlinear tDCS effect represented by ameliorated latencies in the 2 mA and impaired latencies in the 1 mA condition. The reduction of binge eating episodes might indicate a transfer effect to everyday life. Given that the reduction in binge eating was observed before tDCS administration, this effect could not be the result of neuromodulation. Randomized clinical trials are needed to fully understand this reduction, and to explore the efficacy of a combined antisaccade and tDCS training for BED.
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Metadata
Title
Combined antisaccade task and transcranial direct current stimulation to increase response inhibition in binge eating disorder
Authors
Sebastian M. Max
Christian Plewnia
Stephan Zipfel
Katrin E. Giel
Kathrin Schag
Publication date
01-02-2021
Publisher
Springer Berlin Heidelberg
Published in
European Archives of Psychiatry and Clinical Neuroscience / Issue 1/2021
Print ISSN: 0940-1334
Electronic ISSN: 1433-8491
DOI
https://doi.org/10.1007/s00406-020-01164-5

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