Optimal Stimulus Conditions to Improve User Experience in Brain Computer Interfaces
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2022-08-01
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en
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Current Brain Computer Interfaces (BCIs) used for spelling are quite fatiguing
and uncomfortable for the participant to use. It is proposed that
certain stimulus adaptions, such as implementing coloured stimuli, can inhibit
this. This thesis studied the effect of adapting the colour and structure
of checkerboard pattern stimuli on the user’s fatigue and comfort, using a
code-modulated visual evoked potential (c-VEP) based BCI speller interface.
The main focus was on improving this comfort while maintaining a
good system performance. Using five different conditions, it was found that
there is a trade-off between system performance and comfort, and that a
choice needs to be made according to the purpose of the system. It was concluded
that a black-white solid flashing condition was the best performing
stimulus in terms of accuracy of the system, while a violet-grey checkerboard
appeared to be the best condition in terms of user-comfort.
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Faculteit der Sociale Wetenschappen