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repeated measurements particularly in ubiquitous
environments. In this experiment, PPG-based sVRI
is found to be able to reflect the dose-response of the
mental effort invested in cognitive tasks: the mental
effort invested changes with the task difficulties can
be shown efficiently via the sVRIs. This could be
used to evaluate the user experience in an interactive
task or to evaluate the usability of a cognitive design.
ACKNOWLEDGEMENTS
This work is funded by NSFC 61201357 and FIT
foundation of Tsinghua University.
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