Hi,
> Wayne D. Gray wrote
> The chin rest has improved our accuracy greatly. To my surprise, none
> of our Ss has complained about it.
We are using chin rests and bite bars too and I can confirm Wayne's
statement: most of our subjects and patients do not complain about it.
But sometimes it is better not to use them e.g. with psychiatric patients. We
use a neck pillow in order to give a haptic feedback for head movements. It
works fine. I also used an old dentist chair which had the same effect.
Nevertheless we measure head movements together with eye movements,
e.g. by an additional search coil or an ultrasonic marker. Data shows that
there is only a very small portion of subjects and patients that can't keep the
head calm with a haptic feedback from the neck.
Regards,
Andreas
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