Interfacing E-Prime v.1 with EyeLink SR1000

[Candy Patterson]

I have an E-Prime script (several in fact) for an experiment that I
have been running successfully and now wish to collect eye movement
pattern data for these studies using an EyeLink SR1000 eye tracker.
However, despite the EyeLink saying it supports E-Prime I cannot find
an example script that successfully interfaces the two and my attempt
keeps coming back with the same error.

All examples seem to begin with the command 'Sub' which is what is
coming back as the error as an unrecognised command. Not sure if the
rest of the script works as this is the first command that is given
both in the SR manual and other websites. Does anyone know whether it
is possible to use E-Prime on an EyeLink and more importantly has
anyone been able to successfully run a study using the two? I have a
pile of experiments waiting to gain eye data that I would like to keep
as E-Prime scripts. Using version 1 as the EyeLink host computer is
not networked so unable to install version 2.

[Michiel Spape]

Hi,
Please name the exact error (copy paste it from your debug output). Despite me guessing here, I think it's pretty likely that your error is caused by an unfinished line of code, for example:
If [condition] then
Statement
End If

Or
Sub [myGreatFunction]
End
Etc.

The problem is not that E-Prime doesn't do 'Sub' - it means subroutine (or, procedure, if you like). Two possibilities as to what happened here:
- they've made bad examples. Always first try if you get their examples to work, only THEN see if you can implement them in your own code. How else can you know if your EyeLink works?
- your implementation is invalid; somewhere, an if statement is unfinished (it happens quite a lot with my own code as well), or, worse, ended twice (leading the other end to be the end of all code) or ended when it wasn't necessary, as in:
If [condition] then [Statement]
End if
...
The above is what my students do a lot, and, to be frank, it's very understandable and I don't see what visual basic's preoccupation with new lines is. However, if you write the whole bit in one line, this, to basic means, it is also ended in one go. Pretty frustrating if you're used to C or other programming languages.

I don't know EyeLink, only Tobii, but I assume that if they say their software is e-prime compatible (do they have eye-prime add-ons?), I assume it is...
Best,
Michiel

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

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[Candy Patterson]

Thanks for the reply.

After much altering I have managed to run my E-Prime experiment with
an EyeLink eye tracker (several commands are different/not compatible
so trial and error to see what does what). Hopefully should get some
exciting data to support are current findings.

Candy