Hi,
Our experience is that chin rests are very unreliable and almost worse than
nothing at all. Our most successful solution to head stabilisation was a
balsa wood bite bar. this can be implemented in two or three different ways
but is far superior to chin rest or brow rests in all cases.
Basically a 6 or 7 mm thick three inch wide balsa strip is required. This is
then cut into squares and can then be disinfected a good quality ideally
flavoured oral disinfectant . It can then be used purely as a rest for the
upper teeth or as a full bite bar. The teeth slightly penetrate the balsa
and this clamps the head in three dimensions to high precision and it is
very comfortable (in as much as any head restraint can be said to be
"comfortable"). Ensure that the subject has a fully adjustable seat and that
this is adjusted to proper hight after the subject has bitten or rested the
upper teeth on the bar.
The balsa squares can be clamped in a suitable vice mounted on an
adjustable pillar such as can be obtained for optical purposes from thor
labs.
Scott
----- Original Message -----
From: <[log in to unmask]>
To: <[log in to unmask]>
Cc: <[log in to unmask]>; <[log in to unmask]>
Sent: 15 November 2000 17:54
Subject: Chin-rest for eye tracker
>
> Is anyone able to recommend a UK supplier of chin rests: ideally we need
> one of adjustable height that can be clamped to a table top.
>
> This would be for use with an ASL 5000 head-mounted eyetracker.
>
> Many thanks
>
> Sally Clapp
>
>
> Dr Sally Clapp
> Higher Psychologist
> Health and Safety Laboratory
> Broad Lane
> Sheffield
> S3 7HQ
> UK
>
> email: [log in to unmask]
>
> Tel: (+44) 0114 289 2633
> Fax: (+44) 0114 289 2526
>
> url: http://www.hsl.gov.uk
>
>
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