>
> 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
>
I test psychiatric patients (including antipsychotic-naive schizophrenics...) and we use
a head rest / neck support set-up. This is essentially a cushioned 'V' shape, which
patients are encouraged to "relax their head back into". If participants (including
patients) are told that headmovements are to be avoided, they seem to be able to comply.
It is important to ensure that the patient is using the support - sometimes they lean
forward slightly, and then just try and keep their head still, which doesn't work so
well. Obviously if accuracy is very important, then bite bars would be preferable, but
with patients, there are limits to what you can expect them to put up with.
S.B. Hutton
Experimental Psychology
School of Biological Sciences
University of Sussex
Falmer, Brighton
BN1 9QG
tel: 01273 678304
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