Abstract
Recent advances in 3D displays have contributed
to the pressing need of new measurement methods for display comfort.
Developing a valid measurement of visual fatigue caused by 3D display
remains a big challenge and is beneficial for optimizing the system
design. This paper assessed three electroencephalography (EEG) activities,
$\theta,$
$\alpha$
and
$\beta$
, during a monotonous and repetitive random dot stereogram
(RDS) based task in a conventional stereoscopic 3D display. Six types
of ratio indices were computed based on EEG data and assessed as possible
indicators for stereoscopic visual fatigue detection. The results
of critical flicker frequency (CFF) and accommodative amplitude (ACC)
showed that the proposed experiment setup can induce visual fatigue.
According to the subjective ratings, the visual fatigue accumulated
in this task was mostly related to the binocular vision stress of
3D display. Results of EEG data showed stable
$\theta$
activity,
a significant increase of
$\alpha$
activity, and a significant
decrease of
$\beta$
activity over time
$({p} < 0.05)$
. In addition, the
effectiveness of EEG indices was evaluated to measure stereoscopic
visual fatigue by using grey relation analysis (GRA) and verified
by correlating with CFF. The results of analysis suggest that among
all nine types of EEG indices
$(\theta,$
$\alpha,$
$\beta,$
$\theta/\beta,$
$\alpha/\beta,$
$\alpha/\theta,$
$\theta/(\alpha+\beta),
(\alpha+\theta)/\beta, (\alpha+\theta)/(\alpha+\beta)), \alpha$
is the most promising indicator for detecting stereoscopic
visual fatigue.
© 2015 IEEE
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