Touch vs BCI: decreased accuracy increases frustration levels in both

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We investigated whether people get more frustrated when the accuracy of a Brain Computer Interface (BCI) or a touchscreen is varied, and if there is a difference between the two interfaces. The hypothesis was that two different threshold accuracies would exist for both. We further investigated if an increase of frustration affected the performance of a BCI. Four participants selected squares on a screen using either touch or a BCI. Participants were told they would receive feedback depending on their accuracy. But instead the feedback was based on predefined accuracy levels (60%, 70%, 80%, 90% and 100%) for each interface. No difference in frustration was found between 100% and any other percentage of accuracy of the interface (multivariate test: p=0.1330). The direction of the effect was an increase in frustration between 100% and any other percentage of accuracy of the interfaces. Also no interaction between the accuracy of the interfaces and the different interfaces was found (multivariate test: p=0.7322). Thus no threshold for either interface was found. No effect of frustration on the BCI performance was found.
Faculteit der Sociale Wetenschappen