[visionlist] New eye-tracker and monitor advice

[vincent ferrera]

I have several ISCAN trackers that are extremely reliable, but not 
cheap (~14K/ea).  They have analog outputs for horizontal and vertical 
eye position, and pupil diameter.  And they support a variety of 
temporal resolutions (60, 120, 240 Hz), although you trade-off some 
spatial resolution.  Some of my colleagues use ASL, which has 
comparable functionality and reliability.

I have built an eye-tracker for under $2000 based on a system developed 
in Charles Gilbert's lab, but you'd have to contact him for details.

One thing to keep in mind with all eye trackers is that they work best 
when they have a direct view of the eye and the head is immobile.  We 
use an IR "hot" mirror to image the eye and a bite bar (UHCO 
"Headspot") to stabilize the head.  Some systems advertise the ability 
to compensate for head motion, but this works mainly in demos and not 
so well in the lab.

In terms of monitors, what's the latest on DLP technology?  I know 
there was a color-separation issue.  Was that solved by the 3-chip 
systems?  Are there other issues?

On Sep 5, 2007, at 12:40 PM, Louise Whiteley wrote:

> New eye-tracker and monitor advice
> ---------------------------------------
>
> We are about to purchase a new set-up for visual psychophysics 
> experiments, and
> are looking for advice from anyone who is up to date on the relevant 
> technology
> - we want both a new monitor, and an eye tracking device.
>
> In terms of the monitor we need precise timing, a high refresh rate 
> and small
> phosphor decay time, and ideally known calibration properties. In 
> terms of the
> eye-tracker, it must be integrable with Psychtoolbox on MacOSX, and 
> maximum
> comfort for subjects is desirable for our rather long experiments!
>
> Thanks,
>
> Louise Whiteley (Gatsby Unit, UCL).
>
> -- 
> Ms Louise Whiteley
> Wellcome Trust 4yr Neuroscience PhD Student
> Gatsby Computational Neuroscience Unit, UCL
> email: louisew at gatsby.ucl.ac.uk
> tel: +44 207 679 1172
> fax: +44 207 679 1173
> address: Alexandra House, 17 Queen Square, London WC1N 3AR
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