As bite bars and chin rests are relatively uncomfortable (depending on the study,
some may find that way doesnt reflect realistic conditions), it may be useful to
combine a magnetic or optical head-tracker with your eye-tracking-system
(ascension, polhemus, A-R-Tracking, only to mention some) or the usage of a
remote eye-tracking-system. Nevertheless, for best accuracy it is important to
keep the probands head as fixed as possible during calibration. Therefore the
method suggested by Mr. Strachan sounds promising. Another way which I am
going to try out is to let the subjects wear a good suiting, light helmet (like ice-hockey
helmet or sth like that) which is going to be mounted to a frame by a fixable pin-joint
during calibration. Probably it is worth to try this setup during the whole experiment,
provided that your eye-tracker and the helmet fit together.
Regards
Mark
Dipl.-Biol. Mark Brütting
FGAN-Forschungsinstitut für Kommunikation,
Informationsverarbeitung und Ergonomie
Abt. Ergonomie und Führungssysteme
FGAN-Research Institute for Communication,
Information Processing and Ergonomics
Dept. Ergonomics and Information Systems
Neuenahrer Strasse 20
D-53343 Wachtberg-Werthhoven
Tel: +49-(0)228-9435-478
Fax: +49-(0)228-9435-508
> Dear all,
>
> encouraged by the good response regarding my 'dark eye'-problem when using the EL-system
> (thanks again for all your advice!) I'd like to know about your experience with
> constraining participants by chin rests and/or bite bars. Does it improve the qualitiy of
> the eye movement data? Any drawbacks?
>
> I look forward to reading your comments.
>
> Regards,
>
> Cornelia Weigelt, PhD
> IfADo
> Dortmund
> Germany
>
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