Dear colleagues,
if you are interested in how to correctly measure small eye-movements (up to 2°) with current eye-trackers, I recently gave a Zoom talk that might be of interest. You can access it here: https://youtu.be/i6K30JwCzjA <https://youtu.be/i6K30JwCzjA>
It is based on the article I distributed a month ago and on another recent paper which you can access here: https://www.researchgate.net/publication/340447401_Validation_of_a_prototype_hybrid_eye-tracker_against_the_DPI_and_the_Tobii_Spectrum <https://www.researchgate.net/publication/340447401_Validation_of_a_prototype_hybrid_eye-tracker_against_the_DPI_and_the_Tobii_Spectrum>
best regards,
/ Kenneth
> On 24 Mar 2020, at 07.45, Kenneth Holmqvist <[log in to unmask]> wrote:
>
> Dear colleagues in the eye-movement community,
>
> I am very pleased to share our latest paper, the main result of which is that small eye-movements cannot be reliably measured by current video-based P-CR eye-trackers. This result is relevant if we are measuring saccades smaller than appr. 2°, as it shows that P-CR eye-trackers mis-measure those saccades in such a way that our results may be affected, depending on the peculiarities of the study.
>
> Microsaccade research is particularly affected by these mis-measurements, but I would also expect some reading research and other studies of small stimuli to be potentially affected, as these errors continue up to around 2°. See the paper for details.
>
> I am also told that you can access it here: https://rdcu.be/b3cQE <https://rdcu.be/b3cQE>
>
> The error most likely stems from sub-pixel estimation of the CR image in the eye-camera of the eye-trackers. Using the CR to track microsaccades, as has been suggested, is not consistent with our results.
>
> In contrast, the DPI very reliably reports correct amplitudes.
>
> best regards,
> / Kenneth
>
> <Holmqvist_et_al-2020-Behavior_Research_Methods.pdf>
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