Eprime output with eye tracking help

[Michiel Spape]

Hi,
It's a Tobii, yes? The values between 0 and 1 (reported as XY coordinates) are a function of the screen: 0 is left (pixel 1), 1 is right (pixel 640 in 640x480 resolution). This is all thoroughly explained in the documentation. Tobii Extensions for E-Prime also give you, by default, the pixel coordinates themselves; I don't know why you chose not to record these.
Anyway, my suggestion: open a BIG .gazedata file in Excel, look at the column variables, put the manual next to it, and see what it means. Personally, I'd suggest learning Matlab to analyse the data, though I know people who have successfully used Excel, SPSS and even BrainVisionAnalyzer instead. Let us know how you get on with this!
Best,
Mich

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology


-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Ashtyster
Sent: 16 June 2010 12:19
To: E-Prime
Subject: Re: Eprime output with eye tracking help

Well, I've never used E-Prime's output to look at the eye data. So I
have no idea what it looks like.

But why do you need to look at E-Prime output anyway, if you use Tobii
Studio (which allows you not only to get eye coordinates, but also
analyze eye data)?

-Ashtyster

On 16 Jun, 00:06, grighi <gri... at gmail.com> wrote:
> Thank you for the replies.
>
> Unfortunately the information is very scarce and the format of the
> coordinates differs between experiments run using Tobii Studio (the
> eye tracking proprietary software) and Eprime with the extensions.
> While the tobii studio ones are expressed in pixels values, the eprime
> ones are express like 0.5557 and so on.
>
> thanks
> giulia
>
> On Jun 15, 3:24 pm, Ashtyster <ashtys... at gmail.com> wrote:
>
>
>
> > Hi Giulia,
>
> > I've worked with eye-tracking for quite a bit of time. A gaze data
> > file should contain X and Y values (in pixel locations) for both the
> > pupil and corneal reflection.
> > You can check the documentation that came with eye-tracking software
> > for further reference. It's eye-tracking software that creates the dat
> > file with gaze info, not E-Prime.
>
> > Good luck!
>
> > -Ashtyster
>
> > On Jun 15, 8:16 pm, grighi <gri... at gmail.com> wrote:
>
> > > Hi all
>
> > > i was wondering if anybody could tell me how the eye coordinates are
> > > reported in the gazedata file.
> > > Mostly i am not sure what the reference is. Are they expressed in
> > > pixel locations (although they do no look to be to me)?
>
> > > The reason why i would like to know this is to be able to run some
> > > post hoc analysis on specific portions of the stimuli in the screen
>
> > > thanks
> > > giulia- Skjul sitert tekst -
>
> - Vis sitert tekst -

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