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.
|Title of host publication||Proceedings of 2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society|
|Number of pages||4|
|Publication status||Published - 2019|
|Event||2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society - CityCube Berlin, Berlin, Germany|
Duration: 23 Jul 2019 → 27 Jul 2019
|Conference||2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society|
|Period||23/07/2019 → 27/07/2019|