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. 2021 Mar 22;12:640186. doi: 10.3389/fpsyg.2021.640186

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Copyright © 2021 Weidemann and Rußwinkel.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Results of the frustration scales of the NASA-TLX questionnaire after the first (T2) and second (T4) interaction task, mean values and 95% confidence intervals.