Graham
Do you have any more information on this foam? We use a head mounted ASL
eye-tracker and have had problems with being to nice and not tightening the
headband and having it slip during data collection. We would like to tweak
the system before our next round of data collection so that we could tighten
it a little more. Any information that you have about this foam so that we
could look into ordering some would be great.
Thanks
David
On 5/25/04 8:34 AM, "graham barnes" <[log in to unmask]> wrote:
> 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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--
David A. Slykhuis, Ph.D
Science Education
North Carolina State University
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