Dear Mark,
precision is roughly similar, but note that the Spectrum by default produces unfiltered data, while in the EyeLink1000+, you can choose whether to filter or not. This may have a bearing on your results.
Also see our 2020 paper (https://link.springer.com/content/pdf/10.3758/s13428-020-01363-x.pdf) showing that both the Spectrum and the EyeLink1000+ and many other eye-trackers mismeasure the amplitudes of small saccades. These results are in part in contradiction to the paper you mention.
If you are interested in what infant data (with head movements) look like in the EyeLink vs other system, we have investigated the role of head movements on data (https://link.springer.com/article/10.3758/s13428-017-0863-0). Unfortunately, we did not have the Spectrum in this study, but my guess is that it is similar to the TX300.
My opinion is that the EyeLink allows you more control in settings, access to filters, eye images etc, while the Tobii Spectrum attempts to provide a solution where more detail is in a black box.
best regards,
/ Kenneth
> On 9 Mar 2021, at 13.21, Mark Wexler <[log in to unmask]> wrote:
>
> Dear colleagues,
>
> I'm in the market for an eyetracker, mainly for studies of visual
> psychophysics during or near saccades. Most studies will be on adult human
> subjects (usually with chinrests), some will be on head-free infants and
> young children. For stimulus display we use mainly CRTs and projectors.
> We're looking for trackers with sample rates at or above 1000 Hz. From what
> I understand, our options are EyeLink 1000/1000+ and Tobii Pro Spectrum. I
> have a lot of experience with EyeLink, and almost none with Tobii. In terms
> of head-fixed precision, the 2020 paper by Nyström et al. (Beh. Res.
> Methods) says that they're very similar.
>
> I was wondering if the Tobii tracker might be more robust/tolerant with
> respect to head movements, as compared to the "sticker" mode in EyeLink,
> since Tobii is mainly known for head-free systems? Does anyone with
> experience with both systems know if this is the case? I would appreciate
> any other comparisons as well (usability, ease of programming, etc.).
>
> Thank you very much,
> Mark Wexler
>
> --
> Mark Wexler
> Integrative Neuroscience and Cognition Center
> CNRS - Université de Paris
> http://wexler.free.fr
>
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