Additionally, we observed that behavioral performance measures correlated with changes in EEG alpha power of the N-back and the Ospan, yet not of the Dspan. This might indicate specific demands on cognitive control in the N-back task. The theta frequency band power and the P300 amplitude were most pronounced in the N-back task as compared to both span tasks. This might indicate higher demands on WM processing in the former two tasks. The N-back and the Ospan showed timely more prolonged alpha frequency band power effects as compared to the Dspan. Yet, based on the conceptual considerations, we hypothesized that the outcomes of these measures would be more comparable between the N-back and the Ospan as compared to the Dspan. We expected that increasing WM-load would generally lead to a decreased alpha and beta frequency band power, an increased theta frequency band power, and a decreased P300 amplitude. In the current study, we compared an N-back task, a complex operation span task (Ospan), and a simple digit span task (Dspan) by means of typical WM load-related measures of the Electroencephalogram (EEG) like the parietal alpha and beta frequency band power, the frontal theta frequency band power, and the P300 amplitude, to examine whether these tasks would show commonalities or differences in WM processing-load. Thus, conceptually, an N-back task and a complex span task share more commonalities as compared to a simple span task. In contrast, simple span tasks conceptually mainly require WM storage. 5Department of Psychology, Eberhard-Karls-Universität Tübingen, Tübingen, GermanyĪccording to theoretical accounts, both, N-back and complex span tasks mainly require working memory (WM) processing.4Department of Psychology, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany.3Department of Psychology, Humboldt-Universität zu Berlin, Berlin, Germany.2Laboratory for Social and Neural Systems Research, University of Zurich, Zurich, Switzerland.1Knowledge Media Research Center, Tübingen, Germany. ![]() Christian Scharinger 1*, Alexander Soutschek 2, Torsten Schubert 3,4 and Peter Gerjets 1,5
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