We don't have the ASL system, but if the issue is really to do with the
tightness of the headband then one way rond the problem is to line the
headband with a special foam that has good long term compliance but high
short-term impact resistance. We have been using this for many years with
the Skalar Iris system and more recently with the Chronos eye tracker. It
allows you to tighten the hemlet hard without creating pressure points. I
first came across it when it was being developed as a possible liner for
crash helmets, but its most widespread use now seems to be for the
mattresses of hospital beds - I believe it reduces the incidence of bed
sores! I have frequently recommended it to manufacturers, but it seems to
fall on deaf ears.
Graham Barnes.
-----Original Message-----
From: Eye-movement mailing list [mailto:[log in to unmask]]On
Behalf Of Rogers
Sent: 25 May 2004 11:35
To: [log in to unmask]
Subject: Re: [EM_LIST] question regarding lengthy experimentation
I've used an ASL 501 with said headband for the last
6 years. When we first started using it a number of
participants reported headaches after as little time as
15 minutes. I assumed that it was the tightness of
the headband. On close inspection I found that the
band sat in valley above the ridge of bone that forms
the eyebrow and below the plate that forms the
forhead. To try and solve the problem I tilted the
head band back slightly by placing my fingers in the
valley when putting the headset on. This meant that
the band sat over the plate that forms the forhead.
You have to suffle the optics about a bit but I've never
had a participant complain about a headache since.
Some of my experiments have lasted as long as 3
hours!
Steve
> I am wondering if anyone has ever encountered problems with subjects
> getting headaches after using the Iscan head-mounted eye tracker for
> more than 45 minutes (or any other problems with experiments of this
> length). If so, do you have any suggestions on how to address such a
> problem, or an idea of what the time limit for the use of this kind of
> equipment is?
>
> thank you
> Jason Varvoutis
>
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Dr. Steven Rogers
Centre for Ecological Psychology
Department of Psychology
University of Portsmouth
King Henry Building
Portsmouth
PO1 2DY
Tel: (023) 9284 5128
email: [log in to unmask]
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