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Using DataMatrix with Tobii_Pro eyetracker?

Many thanks to @sebastiaan for contributing another excellent tool!

My question: Has anyone used Data Matrix for processing/analyzing data from a Tobii eyetracker?

In order to be able to compare the Tobii vs. Eyelink output files, I tried to read the Eyelink edf files of the semantic_pupil experiment, with no luck. I cannot convert the .edf files to .asc. Could someone, perhaps, upload one as .asc (or other readable format)?

I am also attaching two screenshots of a Tobii X3-120 output .tsv file.

Note that missing (-1) values in pupil size are due to Tobii X3-120 reporting pupil size only in bright pupil mode which is used only every third sample. Thus although this model records eye gaze at 120Hz, it records pupil size at only 40Hz -as this is only a pilot study, I guess this is not too important.

Any advice would be more than welcome!




  • Hi Alexandra,

    Here's a link to one of the datafiles from the semantic-pupil experiment, converted to .asc. This is done with a utility called edf2asc, which you can download for free from the SR Research forum. (But this does require you to register on their forum.)

    It should be straightforward to build an adapter for the EyeLinkParser such that it can read the .tsv files above. (Similar to how this is done for the EyeTribeParser.) Could you upload one complete datafile so that I can see what it looks like exactly?



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  • Hi Sebastiaan,

    Thank you very much for your imediate reply and the asc output file!

    I will have study it, as well as the EyeTribeParser...

    Here you can find a Tobii_Pro output file (it wouldn't let me upload it here).

    Thanks again for everything.

    Best wishes,


  • Hello Sebastiaan,

    Thanks for the useful and open-source toolbox.

    I'm also using data from Tobii, however I have the data en txt format.

    Since the name of the variables are different, my question is how can I rename the variables in order to match with my variables names?

    For example, the first error I get: No column named "set_size"

    I imagine that set_size refers to the pipul width of every trial?

    Then I guess I need to rename the variable set_size for PupilWidth as in my file

    Thank so much in advance!

  • edited March 2020

    Hi Melanni,

    It's not clear to me what you're doing exactly. It sounds like you're using some script to parse some data files and that something goes wrong. But you'll have to be a lot more specific for us to be able to help you! What are you doing exactly?



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  • Hi Sebastiaan,

    Thanks for your response, I'm sorry if I was not clear.

    I have eye-tracker data from Tobii Pro Glasses (I attached the file of one subject).

    I just want to preprocesses the pupil-size signal (column PupilWidth) by getting rid of the blinks, smooth the signal, and all the necessary steps for later on use this signal as a regressor for fmri data.

    As I understood this is a toolbox able to perform such analysis with my data..?



  • Hi Melanni,

    The EyeLinkParser parser a variety of formats, but not this one. So no, you cannot really use it, not without extensive modifications to the code. You could load the data into a DataMatrix object and then use series.blinkreconstruct() and other functions to process the data, and then save it again.

    However, this will require some knowledge of numerical computing with Python, and the nature of your questions suggests to me that you don't have this at the moment. Is there someone in your lab who can help you with this?



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  • Hi @sebastiaan,

    I'm also trying to parse .tsv data from Tobii (tobii fusion pro) using your eyelinkparser module. If I try to parse my data directly using the script you provided here, I get this error:

    Traceback (most recent call last):
      File "C:\Users\psychology.BINUS\AppData\Local\Temp\ipykernel_10976\", line 20, in <cell line: 20>
        dm = get_data()
      File "C:\Users\psychology.BINUS\Anaconda3\envs\opensesame-py3\lib\site-packages\datamatrix\_functional\", line 230, in _call_without_arguments
        self._fnc(*args, **kwargs)
      File "C:\Users\psychology.BINUS\AppData\Local\Temp\ipykernel_10976\", line 15, in get_data
        dm.subject_nr, dm.count_retention_trial_sequence, dm.count_test_trial_sequence, dm.phase, dm.size, dm.correct,dm.test_key_time, dm.ptrace_stim_cue, dm.ptrace_stim_show,
      File "C:\Users\psychology.BINUS\Anaconda3\envs\opensesame-py3\lib\site-packages\datamatrix\_datamatrix\", line 678, in __getattr__
        return self._getcolbyname(name)
      File "C:\Users\psychology.BINUS\Anaconda3\envs\opensesame-py3\lib\site-packages\datamatrix\_datamatrix\", line 458, in _getcolbyname
        raise AttributeError(u'No column named "%s"' % key)
    AttributeError: No column named "subject_nr"

    Any advice on what went wrong and how should I continue? I also attached an example of the data from one participant.



  • Hi @wdhany ,

    This data format, which is non-standard, is simply not supported by EyeLinkParser, or at least not directly.

    In order for this to work, you need to subclass the EyeLinkParser and (mainly) re-implement the split() function such that it takes a line from the data file in your custom format and returns it in the format expected by the EyeLinkParser for further processing. Once that's done, the rest of the parsing will happen automatically.

    This is not as complex as it sounds, and something like the code below should do the trick. Do carefully check whether the results make sense though, because this code has not really been tested!

    — Sebastiaan

    class TobiiParser(EyeLinkParser):
        def __init__(self, **kwargs):
            if u'ext' not in kwargs:  # accept tsv files
                kwargs[u'ext'] = [u'.tar.xz', u'.tsv']
        def is_message(self, line):
            # Recognize message lines. This is inefficient, because we're splitting
            # each line twice
            return self.split(line)[0] == 'MSG'
        def split(self, line):
            l = super().split(line)
            if not l:
                return l
            if isinstance(l[0], str):
                return l
            # Convert to message
            # From: [7358.476, start_trial, 0]
            # To: [MSG, 7358, "start_trial", 0]
            if len(l) != 13:
                l = ['MSG', int(l[0])] + l[1:]
                return l
            # Convert to sample
            # From: See heading in data file for column meanings
            # To: [timestamp, x, y, pupilsize, '...']
            x = l[8]
            y = l[9]
            ps = .5 * (l[10] + l[12])
            return [l[0], x, y, ps, '...']
    dm = TobiiParser(folder='tobii-data').dm

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