By BG - 11/9/2022
We recently purchased a Tobii Nano and have been testing it out using the Tobii plugin. The experiment simply involves watching a video. I was wondering whether someone could help out with the data file. Specifically, while there are values in this file for both eyes in the pixel columns, and values for the left eye in the gaze columns, there seems to be no valid data in the right eye gaze columns (nor the left eye x, y, z, and right eye x, y, z). Is there any reason why we seem to be getting some data for both eyes but not other data?
All best,
Ben
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By seandr - 11/15/2022
Hi Ben,
Thanks for sending the data files and script, and apologies for the slow reply.
I've done some testing and confirmed that Inquisit is correctly reporting the values returned from the eye tracker. It appears not all models return all possible data points. The X3-120, for example, returns 0 for the "user coordinates" of right eye gaze points, similar to your Nano. Likewise, it returns 0 for the "user coordinates" of the right eye position. According to the Tobii docs, these data represent the position of the gaze point and the eyes in 3D space relative to the eye tracker itself. I'm not sure what the practical value of this data is. By default, we report everything in the data file, but you can define the specific fields you'd like to record to filter out irrelevant info.
Typically, you want to know where on the display screen the participant is looking, which is reported via the 2D pixel coordinates of the gaze point: rightpixelx, rightpixely, leftpixelx, leftpixely. Judging from your data file, your Nano is reporting all of these values.
If you need the user coordinates, however, you can use the values from the left eye.
-Sean
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By BG - 11/15/2022
No worries, thanks for taking a look Sean, it's much appreciated and good to hear no issues with the eye-tracker.
All best,
Ben
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By BG - 11/15/2022
Sorry, one more question...
We were planning on purchasing additional Nano's, but just saw that Tobii are launching the 'Spark', which looks to be a replacement for the Nano. I'm assuming that the Tobii plugin would need to specifically be configured to work with this new system (i.e. no cross-system compatibility)?
Thanks again,
Ben
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