Assessing tDCS Placebo Effects on EEG and Cognitive Tasks

Tine Holmback Petersen, Sadasivan Puthusserypady

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Abstract

Divergent thinking (DT) using transcranial direct current stimulation (tDCS) has previously been documented with promising results. This paper examines the placebo effect of tDCS. The reaction from a placebo group was tapped using electroencephalogram (EEG). Their performance was measured as a creativity score and compared to a control group. The experiments included multiplication problems and two DT tasks: Alternative Uses Tasks (AUT) and Instances Task (IT). Neither of the groups were sham stimulated during AUT, but during IT the placebo group was sham stimulated. An automatic noise-detection algorithm was developed to remove the speech-induced EEG noise. Features of power, Welchs power spectral density (WPSD) and Welchs cross PSD (WCPSD)/frequency-band/channel were extracted and fed to the Support Vector Machine (SVM) classifiers. The χ2-test showed a significant difference (p<0.001) between the no stimulation and sham stimulation conditions when compared to the control group, confirming a placebo effect.
Original languageEnglish
Title of host publicationProceedings of 2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Number of pages4
PublisherIEEE
Publication date2019
Pages4509-4512
ISBN (Print)978-1-5386-1311-5
DOIs
Publication statusPublished - 2019
Event2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society - CityCube Berlin, Berlin, Germany
Duration: 23 Jul 201927 Jul 2019
https://embc.embs.org/2019/

Conference

Conference2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society
LocationCityCube Berlin
CountryGermany
CityBerlin
Period23/07/201927/07/2019
Internet address

Cite this

Petersen, T. H., & Puthusserypady, S. (2019). Assessing tDCS Placebo Effects on EEG and Cognitive Tasks. In Proceedings of 2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (pp. 4509-4512). IEEE. https://doi.org/10.1109/EMBC.2019.8857549